feat: bump firebase sdk versions, add GoogleApi dep, use Android API29

[mikehardy]

Description

This bumps firebase-ios-sdk to 6.31.0, Android to 25.7.0, and Android compile/target to API29

Also:

• cleans up the non-functional gradle wrapper files in the packages
• centralizes all the gradle versioning to app/package.json (overrides still possible)

Related issues

Fixes #3943

Release Summary

feat: bump firebase sdk versions, add GoogleApi dep, use Android API29

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

This is not supposed to be breaking in any way, although it does touch critical dependencies.

There are no breaking changes noted between the previous upstream SDK dependencies or Android APIs we relied on and the ones I moved to, and all the e2e tests work plus they work in my work project.

Worst case, all of them may be overridden.

This did finally expose the GoogleApisAvailability build error I was having though - it appears to be as simple as updating Android APIs to 29 / Gradle 4.0.1 - without the dependency on google's play store auth library, compiles fail, and it was noticed by someone else today.

I marked it as a feature release since it is not breaking but people should be aware the default SDKs changed (feature releases themselves, so transitively it seems to fit)

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[Salakar]

Nice, LGTM

[JiboStore]

Hi,

Your changes from:
def firebaseBomVersion = appPackageJson['sdkVersions'] ? appPackageJson['sdkVersions']['android']['firebase'] : "25.5.0"

To:
def firebaseBomVersion = appPackageJson['sdkVersions']['android']['firebase']

causes crash while building:

* What went wrong:
A problem occurred evaluating project ':react-native-firebase_perf'.
> Cannot get property 'android' on null object

Is there anything we need to add to our app's package.json?