Realtime pipeline public preview

[cherylEnkidu]

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	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 makes the realtime pipeline feature public. This involves changing several Swift APIs from internal to public and includes a significant, well-structured refactoring of the C++ expression evaluation logic. The new create(from: Query) function is a great addition for converting standard queries to pipelines.

My main feedback is to improve the safety of the new create(from:) method in RealtimePipelineSource.swift by replacing forced casts and fatalError with proper error handling, which is crucial for a public API. I also found a minor typo in a new test name.

The C++ refactoring is a great improvement, making the expression evaluation logic more modular and readable. The renaming of functions like lt to less_than and eq to equal enhances clarity.

Overall, this is a solid PR that makes a powerful feature available to users.