Impossible to setup a monorepo multi app project.

**Description:**
I've been trying to setup a monorepo multi app project, I've read #3281 issue and most of the linked issues and commits, specially 2d53c99 and [multi-app-projects](https://beta.ionicframework.com/docs/cli/configuration#multi-app-projects).
And I think this is not working properly.

The `angular.json` is as it should be for multiple projects, as @stupidawesome pointed in that issue (#3281) and my `ionic.config.json` is like this:

```
{
"defaultProject": "aclient-ionic-app",
"projects": {
"aclient-ionic-app": {
"name": "IonicApp",
"integrations": {
"cordova": {
"root": "integrations/aclient-ionic-app/cordova"
}
},
"type": "angular",
"root": "apps/aclient/ionic-app/"
}
},
"anotherclient-anotherapp": {}
}
```

And I intend to a folder structure like this (or at least something that works):

```
.
├── apps
| ├── aclient
| | ├── ionic-app
| | └── ionic-app-e2e
| └── anotherclient
| | ├── anotherapp
| | └── anotherapp-e2e
├── integrations
| ├── aclient-ionic-app
| | └── cordova
| | ├── build.json
| | ├── config.xml
| | ├── platforms
| | | ├── ios
| | | └── android
| | ├── plugins
| | ├── resources
| | └── www
| └── anotherclient-anotherapp
| ├── cordova
| └── electron
├── node_modules
├── angular.json
├── ionic.config.json
└── package.json
```

The problem is that `ionic integrations enable cordova --add --project aclient-ionic-app` generates `resources` and `config.xml` inside `apps/aclient/ionic-app` and then automatically adds `"integrations": { "cordova": {} }` in the root of `ionic.config.json` ouside of `projects`. I don't think that's the intended behaviour.

Then I try `ionic cordova platform add ios --project aclient-ionic-app` and throws an error:

```
$ ionic cordova platform add ios --project aclient-ionic-app
✔ Creating ./integrations/aclient-ionic-app/cordova/www directory for you - done!
[ERROR] Cannot load Cordova config.

Could not find necessary file(s): config.xml, package.json.

- ./integrations/aclient-ionic-app/cordova/config.xml
- ./integrations/aclient-ionic-app/cordova/package.json

You can re-add the Cordova integration with the following command: ionic integrations enable cordova --add
```

So, to fix it in a hacky way I moved manually the file `config.xml` and the `resources` folder into `integrations/aclient-ionic-app/cordova` as well as initiate a npm folder inside cordova and thus creating the `package.json`.
Now running `ionic cordova platform add ios --project aclient-ionic-app` installs cordova plugins correctly. But the part that runs `ionic cordova resources ios --force` fails.

```
...
...
> ionic cordova resources ios --force
> cordova-res ios
[cordova-res] ERROR: Missing source image for "icon" (sources: resources/ios/icon.png, resources/ios/icon.jpg, resources/ios/icon.jpeg, resources/icon.png, resources/icon.jpg, resources/icon.jpeg)
[ERROR] An error occurred while running subprocess cordova-res.

cordova-res ios exited with exit code 1.

Re-running this command with the --verbose flag may provide more information.
```

Ignoring that error by now I pass to the next thing and then, when I run `ionic cordova prepare ios --project aclient-ionic-app` fails.
Output with verbose:

```
$ ionic cordova prepare ios --project aclient-ionic-app --verbose
ionic:lib Terminal info: { ci: false, shell: '/usr/local/bin/bash', tty: true, windows: false } +0ms
ionic:lib CLI global options: { _: [ 'cordova', 'prepare', 'ios' ], help: null, h: null, verbose: true, quiet: null, interactive: true, color: true, confirm: null, json: null, project: 'aclient-ionic-app', '--': [] } +4ms
ionic:lib:project Project id from args: aclient-ionic-app +0ms
ionic:lib:project Project type from config: @ionic/angular (angular) +0ms
ionic:lib:project Project details: { configPath: '/Users/ignition42/monorepo/ionic.config.json', errors: [], context: 'multiapp', id: 'aclient-ionic-app', type: 'angular' } +0ms
ionic Context: { binPath: '/usr/local/lib/node_modules/ionic/bin/ionic', libPath: '/usr/local/lib/node_modules/ionic', execPath: '/Users/ignition42/monorepo', version: '5.2.3' } +0ms
ionic:lib:integrations:cordova:config Loading Cordova Config (config.xml: '/Users/ignition42/monorepo/integrations/aclient-ionic-app/cordova/config.xml', package.json: '/Users/ignition42/monorepo/integrations/aclient-ionic-app/cordova/package.json') +0ms
ionic:lib:telemetry Sending telemetry for command: 'ionic cordova prepare' [ 'ios',
ionic:lib:telemetry '--verbose',
ionic:lib:telemetry '--interactive',
ionic:lib:telemetry '--color',
ionic:lib:telemetry '--project=aclient-ionic-app' ] +0ms
ionic:lib:build build options: { '--': [],
ionic:lib:build engine: 'cordova',
ionic:lib:build platform: 'ios',
ionic:lib:build project: 'aclient-ionic-app',
ionic:lib:build verbose: false,
ionic:lib:build configuration: undefined,
ionic:lib:build sourcemaps: undefined,
ionic:lib:build cordovaAssets: true,
ionic:lib:build type: 'angular' } +0ms
Error: ENOENT: no such file or directory, open '/Users/ignition42/monorepo/apps/aclient/ionic-app/package.json'
ionic Error: ENOENT: no such file or directory, open '/Users/ignition42/monorepo/apps/aclient/ionic-app/package.json' +132ms
```

Since before enabling cordova added `"integrations": { "cordova": {} }` in `ionic.config.json` I tried to add the root.

```
{
"defaultProject": "aclient-ionic-app",
"projects": {
"aclient-ionic-app": {
"name": "IonicApp",
"integrations": {
"cordova": {
"root": "integrations/aclient-ionic-app/cordova"
}
},
"type": "angular",
"root": "apps/aclient/ionic-app/"
}
},
"integrations": {
"cordova": {
"root": "integrations/aclient-ionic-app/cordova"
}
}
}
```

It didn't help at all.

Last thing I tried is to copy all cordova files (`config.xml`, `node_modules`, `package-lock.json`, `package.json`, `platforms`, `plugins`, `resources`, `www`) into `apps/aclient/ionic-app/` and then run `ionic cordova prepare ios`.

```
$ ionic cordova prepare ios --project aclient-ionic-app --verbose
ionic:lib Terminal info: { ci: false, shell: '/usr/local/bin/bash', tty: true, windows: false } +0ms
ionic:lib CLI global options: { _: [ 'cordova', 'prepare', 'ios' ], help: null, h: null, verbose: true, quiet: null, interactive: true, color: true, confirm: null, json: null, project: 'aclient-ionic-app', '--': [] } +3ms
ionic:lib:project Project id from args: aclient-ionic-app +0ms
ionic:lib:project Project type from config: @ionic/angular (angular) +0ms
ionic:lib:project Project details: { configPath: '/Users/ignition42/monorepo/ionic.config.json', errors: [], context: 'multiapp', id: 'aclient-ionic-app', type: 'angular' } +0ms
ionic Context: { binPath: '/usr/local/lib/node_modules/ionic/bin/ionic', libPath: '/usr/local/lib/node_modules/ionic', execPath: '/Users/ignition42/monorepo', version: '5.2.3' } +0ms
ionic:lib:integrations:cordova:config Loading Cordova Config (config.xml: '/Users/ignition42/monorepo/integrations/aclient-ionic-app/cordova/config.xml', package.json: '/Users/ignition42/monorepo/integrations/aclient-ionic-app/cordova/package.json') +0ms
ionic:lib:telemetry Sending telemetry for command: 'ionic cordova prepare' [ 'ios',
ionic:lib:telemetry '--verbose',
ionic:lib:telemetry '--interactive',
ionic:lib:telemetry '--color',
ionic:lib:telemetry '--project=aclient-ionic-app' ] +0ms
ionic:lib:build build options: { '--': [],
ionic:lib:build engine: 'cordova',
ionic:lib:build platform: 'ios',
ionic:lib:build project: 'aclient-ionic-app',
ionic:lib:build verbose: false,
ionic:lib:build configuration: undefined,
ionic:lib:build sourcemaps: undefined,
ionic:lib:build cordovaAssets: true,
ionic:lib:build type: 'angular' } +0ms
ionic:lib:hooks Looking for ionic:build:before npm script. +0ms
ionic:lib:build Looking for ionic:build npm script. +8ms
> ng run aclient-ionic-app:ionic-cordova-build --platform=ios --cordova-base-path=/Users/ignition42/monorepo/integrations/aclient-ionic-app/cordova
Target 'ionic-cordova-build' could not be found in project 'aclient-ionic-app'.
Error: Target 'ionic-cordova-build' could not be found in project 'aclient-ionic-app'.
at Architect._getProjectTarget (/Users/ignition42/monorepo/node_modules/@angular-devkit/architect/src/architect-legacy.js:111:19)
at Architect.getBuilderConfiguration (/Users/ignition42/monorepo/node_modules/@angular-devkit/architect/src/architect-legacy.js:118:29)
at RunCommand.runSingleTarget (/Users/ignition42/monorepo/node_modules/@angular/cli/models/architect-command.js:160:45)
at RunCommand.runArchitectTarget (/Users/ignition42/monorepo/node_modules/@angular/cli/models/architect-command.js:201:35)
at RunCommand.run (/Users/ignition42/monorepo/node_modules/@angular/cli/commands/run-impl.js:14:25)
at RunCommand.validateAndRun (/Users/ignition42/monorepo/node_modules/@angular/cli/models/command.js:124:31)
at process._tickCallback (internal/process/next_tick.js:68:7)
at Function.Module.runMain (internal/modules/cjs/loader.js:832:11)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
[ERROR] An error occurred while running subprocess ng.

ng run aclient-ionic-app:ionic-cordova-build --platform=ios --cordova-base-path=... exited with exit code 1.

Re-running this command with the --verbose flag may provide more information.
ionic:utils-process onBeforeExit handler: 'process.exit' received +0ms
ionic:utils-process onBeforeExit handler: running 1 functions +0ms
ionic:utils-process processExit: exiting (exit code: 1) +32ms
```

Moving files around and trying to trick the system is not ideal, but I didn't think of any other way to make it work, I think this is broken or I might have missed something.

**My `ionic info`:**
```
$ ionic info
[ERROR] Error loading @ionic/angular-toolkit package.json: Error: Cannot find module '@ionic/angular-toolkit/package'

Ionic:

Ionic CLI : 5.2.3 (/usr/local/lib/node_modules/ionic)
Ionic Framework : @ionic/angular 4.6.2 (/Users/ignition42/monorepo/node_modules/@ionic/angular)
@angular-devkit/build-angular : 0.13.9 (/Users/ignition42/monorepo/node_modules/@angular-devkit/build-angular)
@angular-devkit/schematics : 7.3.1 (/Users/ignition42/monorepo/node_modules/@angular-devkit/schematics)
@angular/cli : 7.3.1 (/Users/ignition42/monorepo/node_modules/@angular/cli)
@ionic/angular-toolkit : not installed

Cordova:

Cordova CLI : 9.0.0 (cordova-lib@9.0.1)
Cordova Platforms : ios 5.0.1
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.1.1, (and 4 other plugins)

Utility:

cordova-res : 0.6.0
native-run : not installed

System:

NodeJS : v10.16.0 (/usr/local/Cellar/node@10/10.16.0/bin/node)
npm : 6.9.0
OS : macOS Mojave
```