fix(schematics): Various improvements (angular#2961)

* Support multiple package managers on ng deploy, fixes angular#2841
* Don't cache ngsw, fixes angular#2259
* Got rid os AppCheck debug token on Node, opted for a better pattern in `samples/advanced`
* Added a new pattern for connecting the emulators in `samples/advanced`

feat(schematics): adding multi-user support. (angular#2958)

Utilize firebase-tools multi user support to allow an account picker on `ng add`

fixes(schematics): ng add/deploy universal fixes (angular#2954)

* `findModuleFromOptions` wasn't working well when SSR was added to the mix, drop
* shell out the logged in user(s)
* fixed Cloud Functions dependencies all being dev
* added `file-loader` dep so the Firestore loaders work out of box

fix(schematics): Missing deps, fixed ng add bug (angular#2952)

feat(schematics): Super charge the schematics (angular#2836)


Co-authored-by: Tomek Sułkowski <sulco@users.noreply.github.com>

chore(release): Release 7.0.4 (angular#2928)

chore(release): 7.0.3 (angular#2915)

* Deploy server default is `bundleDependencies: true`, correct this when generating the functions package.json
* `onMessage` callback should fire in the ng zone
* Auth was wrapping exports it wasn't suppose to
* Don't fail the deploy if there isn't an `index.html` file
* Lazifying the sample
* Cleaning up user-agent reporting
* Marking the samples as autogenerated, to reduce noise
* Committing the firebase/rxfire/base.ts files for easier readability
* Version and changelog entry
* Test cleanup and get storage emulator working

chore(release): 7.0.2 (angular#2911)

chore(release): 7.0.1 (angular#2908)

### Bug fixes

* **messaging:** `onMessage` will no longer destablize the Angular Zone
* **core:** Injected Classes now have a better fallback pattern for finding defaults, [angular#2909](angular#2909) allowing use of emulators and other config options as expected
* **schematic:** upgrade schematic will no longer rewrite `.ts` files outside of your project root, [angular#2907](angular#2907)

### Misc

* **changelog(7.0.0):** break notice for `compat/auth#useEmulator`
* **changelog(7.0.0):** feature of `compat/storage#useEmulator`
* **changelog(7.0.1):** Added entry
* **sample(modular):** Adding `connectEmulator` examples
* **sample(compat):** Cleaned up the service worker registration
* **functions:** defensively load auth first, if provided
* **storage:** defensively load auth first, if provided
* **compat/firestore:** clean up how auth is initialized
* **compat/database:** clean up how auth is initialized

chore(release): Release v7 (angular#2898)