[realppl 11] Add query to pipeline support

[wu-hui]

No description provided.

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[google-oss-bot]

	1 Warning
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)

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[cherylEnkidu]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces support for converting Firestore queries into pipelines, which is a significant architectural improvement allowing query execution to leverage the pipeline infrastructure. The changes are well-implemented across C++, Objective-C, and Swift layers. The core conversion logic in C++ has been nicely refactored for clarity and correctness, especially in handling limits and cursors. The testing strategy is robust, featuring a new comprehensive test suite and cleverly adapting existing integration tests to cover the new execution path. The API improvements in Swift, such as more descriptive method names and stateless stage objects, enhance code quality. Overall, this is an excellent contribution. I have one minor suggestion for consideration.