Capacitor Firebase Auth

I would love this plugin to become a community plugin:
https://github.com/baumblatt/capacitor-firebase-auth

## Plugin Request
**current name**: capacitor-firebase-auth

**Proposed package**: `@capacitor-community/firebase-auth`

### Platform(s)
all

### Existing Solutions
https://github.com/baumblatt/capacitor-firebase-auth

Start by reviewing the existing capacitor-firebase-auth plugin at the linked repository and the proposed @capacitor-community/firebase-auth package name. Clarify which platforms are required by the “all” request and define the contribution scope before implementation can begin.

Written by the indexing model from the issue text.