chore(firestore): deprecation warnings for v8 API ahead of future major release

[russellwheatley]

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
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• This is a breaking change;
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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 20, 2024 9:12am

[mikehardy]

Monster PR, amazing.
I don't see anything wrong with it other than the two now-obsolete comments.

I recognize it is semi-complicated with the proxy/reflexive stuff but I also can't think of any other way to centralize all of it without doing something similar, so still +1 on the style

Hopefully the rest of the modules are easier !