[FR]: Play Games for PC support for Firestore, Database and AB Tests

### Description

As part of the PC compatibility checklist for Play Games for PC, it is mentioned that [Firestore, Realtime Database and AB Tests are not supported](https://developer.android.com/games/playgames/pc-compatibility#unsupported-pgs-modules). Given these are the only packages preventing Firebase to be a one stop shop for also supporting Play Games for PC, are there any plans to add support? If so not, what is the reason this is not planned? Given in the Editor e.g. it also works? What are suggested workarounds?


### API Proposal

_No response_

### Firebase Product(s)

Firestore, AB Testing, Database

### Targeted Platform(s)

Desktop