`import/order` ignores `pathGroups`

Hi there,

I'm trying to use `import/order` with this setting:
```json
"import/order": [
"error",
{
"alphabetize": {
"order": "asc",
"caseInsensitive": false
},
"groups": [
["builtin", "external"],
["internal", "parent", "sibling", "index"]
],
"newlines-between": "always",
"pathGroups": [
{
"pattern": "app/**",
"group": "internal"
}
],
"distinctGroup": false
}
],
```

When I run the code, the linter orders the imports like this:
```ts
import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { ExternalUserPasswordResetModalComponent } from 'app/account/password-reset/external/external-user-password-reset-modal.component';
import { ArtemisSharedModule } from 'app/shared/shared.module';

import { accountState } from './account.route';
import { ActivateComponent } from './activate/activate.component';
```

When instead it should order it like this:
```ts
import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';

import { accountState } from './account.route';
import { ActivateComponent } from './activate/activate.component';
import { ArtemisSharedModule } from 'app/shared/shared.module';
import { ExternalUserPasswordResetModalComponent } from 'app/account/password-reset/external/external-user-password-reset-modal.component';
```

Can you tell me, why my `pathGroups` and my `groups` setting to not work?

Thanks!

Reproduce the reported import/order configuration and compare the actual and expected ordering shown in the issue. Start by tracing the import/order rule's handling of pathGroups, groups, and distinctGroup; done when the configuration produces the expected ordering or the limitation is clearly documented.

Written by the indexing model from the issue text.