[FR] Please create seperate macOS architechture files

### Feature proposal

* Firebase Component: Core (Auth, Core, Database, Firestore, Messaging, Storage, etc)

Describe your use case and/or feature request here.

I am trying to build Firebase UPM packages from your tgz files to distribute over Github since you still don’t do it (Google Play Plugins does fyi)
In Firebase 9.1.0 the .bundle size is 130 mb which is too big for Github (unless using LFS).
I look at the file and your build scripts and noticed you are using lipo to merge the arm64 and x86_64 archs together to make that bundle file.
If I use lipo to extract each architecture the files are 70 mb each.

Can you please consider stop doing that as there is no need for it, just specify the arch for each file in Unity .meta file