fix: fix mypy for services with extended operations methods

[parthea]

This PR fixes the following issue when running mypy for google-cloud-compute and google-cloud-compute-v1beta where we see error: Name "Any" is not defined [name-defined] when running mypy

See follow up issue to improve the golden files where the mypy presubmit is run on generated code.: #2535
See follow up bug for pre-release failure: googleapis/proto-plus-python#558

[gemini-code-assist]

Summary of Changes

Hello @parthea, 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 addresses and resolves a mypy type-checking error that arose in generated Python client libraries, specifically for services that incorporate extended operations methods. The fix ensures that the necessary typing.Any import is present only when required, thereby maintaining type-hinting correctness and allowing the generated code to pass static analysis without errors.

Highlights

• Mypy Error Resolution: Fixed Name "Any" is not defined mypy errors that occurred in generated client libraries for services like google-cloud-compute and google-cloud-compute-v1beta.
• Conditional Typing Import: Implemented a conditional import for typing.Any within the base.py.j2 template. This ensures Any is only imported when a service utilizes extended operations methods, preventing unnecessary imports and resolving mypy issues.

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[gemini-code-assist]

Code Review

This pull request addresses a mypy error (Name "Any" is not defined) that occurs for services with extended operations methods. The fix involves conditionally importing Any from the typing module only when service.any_extended_operations_methods is true, which is also the condition for Any being used in the template. This is a clean and correct solution that not only fixes the bug but also avoids potential unused import warnings in services without extended operations. The change is well-targeted and looks good.