[AI] Conform GenerationConfig and Schema to Equatable

[andrewheard]

Added Equatable conformance to GenerationConfig and Schema as a prerequisite for making Transcript conform to Equatable in #15942. Added unit tests for the Equatable implementation for Schema since auto-synthesis is not supported for classes.

#no-changelog

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Code Review

This pull request adds Equatable conformance to GenerationConfig and Schema. The changes are straightforward and well-tested. For GenerationConfig, adding Equatable conformance is sufficient as the compiler can synthesize the implementation. For Schema, a manual implementation of Equatable is provided. I've suggested letting the compiler synthesize this as well for better maintainability. The new unit tests for Schema's Equatable conformance are comprehensive and cover various scenarios.