feat: Add support for custom task store in to_a2a function. Replaces PR #3639

[secprog]

This update introduces an optional task_store parameter to the to_a2a function, allowing users to provide a custom task store instance. If not specified, the function defaults to using InMemoryTaskStore. Additionally, unit tests have been added to verify the functionality with a custom task store.

Replaces my old closed PR #3639.

[gemini-code-assist]

Summary of Changes

Hello @secprog, 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 introduces a key enhancement to the to_a2a function, providing greater flexibility in how task management is handled within A2A applications. By allowing the injection of custom task store instances, it moves beyond a fixed in-memory solution, enabling more adaptable and scalable architectures. This change is accompanied by dedicated unit tests to confirm its proper functionality.

Highlights

• Custom Task Store Support: The to_a2a function now accepts an optional task_store parameter, enabling users to provide their own custom task store implementation instead of relying solely on the default InMemoryTaskStore.
• Enhanced Flexibility: This change significantly improves the extensibility of A2A applications by allowing developers to integrate diverse storage solutions for tasks, catering to specific application requirements.
• Unit Test Coverage: New unit tests have been added to thoroughly verify the correct behavior of the to_a2a function when a custom task store is supplied, ensuring robustness and reliability.

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[gemini-code-assist]

Code Review

This pull request introduces a valuable feature by allowing a custom task_store to be passed to the to_a2a function, defaulting to InMemoryTaskStore if not provided. The implementation is clean and straightforward. The documentation has been updated effectively with a clear explanation and a helpful usage example. Furthermore, a new unit test has been added that thoroughly verifies the new functionality. I've noted one minor style suggestion regarding import formatting according to PEP 8. Overall, this is a well-executed and welcome enhancement.

[gemini-code-assist]

According to PEP 8, there should be a blank line separating third-party imports from local application imports. google.genai is a third-party import, while utils is a local import.

Suggested change

	from google.genai import types
	import utils
	from google.genai import types
	import utils

References

1. PEP 8 recommends grouping imports into standard library, third-party, and local application sections, with a blank line between each group. ^(link)