feat(fdc): Streaming implementation for data connect

[aashishpatil-g]

Implements streaming support in Firebase Data Connect for subscribe().

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[aashishpatil-g]

/gemini review

[gemini-code-assist]

Code Review

This pull request implements real-time streaming support for the Firebase Data Connect SDK by introducing a WebSocket-based transport layer and a new streaming protocol. It transitions the library from gRPC to a hybrid REST and WebSocket approach, managed by a routing transport. Feedback highlights critical issues regarding resource management, specifically the potential for leaked WebSocket connections and memory leaks from uncancelled subscriptions. Other recommendations include optimizing the expensive operation ID generation, ensuring consistency by making variables final, and adhering to style guidelines regarding function length and the use of the non-null assertion operator.