feat(firestore): add OnSnapshotsInSync support

[Ehesp]

Description

Adds support for onSnapshotsInSync API.

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • [x] Yes
• My change supports the following platforms;
  • [x] Android
  • [x] iOS
• 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
  • [x] No

Test Plan

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[codecov[bot]]

Codecov Report

Merging #5159 (f54f0a4) into master (245149c) will decrease coverage by 51.85%. The diff coverage is n/a.

:exclamation: Current head f54f0a4 differs from pull request most recent head 2a97be0. Consider uploading reports for the commit 2a97be0 to get more accurate results

@@             Coverage Diff             @@
##           master    #5159       +/-   ##
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- Coverage   88.56%   36.71%   -51.84%     
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  Files         109       51       -58     
  Lines        3739     1512     -2227     
  Branches      358      358               
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- Hits         3311      555     -2756     
- Misses        383      729      +346     
- Partials       45      228      +183     

[Salakar]

There's an existing PR for this here: https://github.com/invertase/react-native-firebase/pull/4029 does this supersede that one? There was some notes on testing issues on the other one

[Ehesp]

Oh, duh. Will check it out 🤦‍♂️

[github-actions[bot]]

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