`platform add` should output version that was installed of the platform

# Feature Request

## Motivation Behind Feature
Currently the user does not really see what platform version was installed, only what "version" was pinned and used with `cordova-fetch`:

```
E:\Projects\throwaway\cordovaElectronDevice2 (helloworld@1.0.0)
λ cordova platform add browser
Using cordova-fetch for cordova-browser@^6.0.0
Adding browser project...
Creating Cordova project for cordova-browser:
Path: E:\Projects\throwaway\cordovaElectronDevice2\platforms\browser
Name: HelloCordova
Discovered plugin "cordova-plugin-whitelist" in config.xml. Adding it to the project
Installing "cordova-plugin-whitelist" for browser
Adding cordova-plugin-whitelist to package.json

E:\Projects\throwaway\cordovaElectronDevice2 (helloworld@1.0.0)
λ cordova platform add electron
Using cordova-fetch for cordova-electron@^1.0.0
Adding electron project...
Creating Cordova project for cordova-electron:
Path: E:\Projects\throwaway\cordovaElectronDevice2\platforms\electron
Name: HelloCordova
Installing "cordova-plugin-whitelist" for electron
```

## Feature Description
The output should have an additional line that could read `Installed cordova-electron@1.0.2` or similar.

## Alternatives or Workarounds
`cordova plugin list` or `npm list --depth=0`

Start at the `cordova platform add` command and trace the output around the `cordova-fetch` installation shown in the issue. Confirm where the resolved platform version becomes available, then verify that a successful install reports the installed package and version in addition to the pinned range.

Written by the indexing model from the issue text.