feat(firestore): Add data converter

[supersimple33]

Description

I have added the withConverter method which is provided in the JS sdk to the package here.

Release Summary

• Added withConverter to CollectionReference
• Created new interface FirestoreDataConverter

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes 🔥
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

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Project	Deployment	Preview	Comments	Updated (UTC)
react-native-firebase	Ready	Preview	Comment	Aug 23, 2025 5:55pm

[CLAassistant]

All committers have signed the CLA.

[supersimple33]

Bump!