[FR] Please support webgl platform

### Feature proposal

* Firebase Component: all

I wish I could use firebase C# api in webgl build of unity. At least please start a branch to allow direct git UPM over this repo and have some wrapper guideline for us to expand it with unity `.jslib`

The issue names no repository file or test; start by examining how the Unity C# API and Firebase components are packaged for WebGL builds. Clarify whether the request is direct Git UPM support, WebGL support across all components, or wrapper guidance using Unity .jslib files. Done requires a defined scope and an agreed implementation path.

Written by the indexing model from the issue text.