optimize gapic

[ohmayr]

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @ohmayr, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request implements a significant performance optimization by introducing a caching mechanism for context-aware schema objects. By passing a shared context_cache through the with_context methods, the system can avoid recomputing identical object derivatives, especially those involved in resolving naming collisions. This change aims to reduce processing time and improve the overall efficiency of the GAPIC generator.

Highlights

• Introduced Context Caching: A context_cache dictionary is now passed through various with_context methods across api.py, metadata.py, and wrappers.py to store and reuse previously computed context-aware objects, preventing redundant calculations.
• Optimized with_context Calls: The with_context methods in Address, Metadata, Field, MessageType, EnumType, ExtendedOperationInfo, OperationInfo, Method, and Service now check the context_cache before performing computations, returning cached results if available.
• Early Exit for MessageType: An optimization was added to MessageType.with_context to return the current instance early if the collisions set has not changed, further reducing redundant processing.
• Global Collisions as Frozenset: In api.py, naive.names is now converted to a frozenset (global_collisions) once and reused, improving efficiency when passed to multiple with_context calls.

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[gemini-code-assist]

Code Review

This pull request introduces a caching mechanism to optimize with_context calls, which is a good idea for performance. However, the implementation has a few issues that need to be addressed: a critical bug in api.py that will cause a runtime error, and several issues with the caching implementation itself regarding type safety, potential cache corruption, and code duplication. My detailed comments point out these issues with suggestions for fixes.