feat(firebase-ai): create `ai` package, `vertexai` wraps around it

[russellwheatley]

Description

• Moved the bulk of code to new ai package. Kept relevant types in vertexai package and deprecated them.
• Updated implementation (where possible) to match firebase-js-sdk.
• Updated mocks to match latest implementation on vertexai-sdk-test-data repo which now segments responses from vertexai and googleai.
• I did attempt to symlink ai into vertexai but nested symlinks within directories were not being packaged in dist/ so opted to make ai package a dependency which I think is a better way of doing it.
• Created an ai example app for illustration and tested latest vertexai and ai implementations which surfaced a couple of subtle bugs that have been resolved.

Important

• We need to do the same attribution as we did for vertexai for this pull request.
• Double check what needs to be in the CHANGELOG for this release.

Related issues

Release Summary

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 18, 2025 0:22am

[mikehardy]

Looking into this one now for review - noticed Other tests were failing because TextEncoder implementation seems to be missing and is needed ? Unexpected as it seems that should have been failing for a while if so, but...okay

rebased to main and put an in situ implementation of the string -> uint8array conversion in the storage library and it passes locally, hopefully this goes green in CI - will finish the review later