feat(functions): httpsCallable.stream support

[MichaelVerdon]

Description

@russellwheatley taken over:

• I had to create a swift implementation for callables as the Swift firebase-ios-sdk is the only way to set limited app check token.
• As mentioned internally, the HttpsCallableStreamOptions will only apply to web streaming. Use HttpsCallableOptions for iOS and android http rest calls/streaming.
• I created an asynciterator for cancelling streams on web as AbortSignal isn't available on any version of RN lower than v.81.
• refactored android and removed UniversalFirebaseFunctionsModule.java‎. This required making TaskExecutorService constructor public on Firebase App so we can still use it.
• refactored android, ios and TS to remove code duplications.

Related issues

fixes #8210

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	Actions	Updated (UTC)
react-native-firebase	Ready	Preview, Comment	Jan 30, 2026 4:53pm