fix: Ensure metadata propagation for Task ToProto and FromProto conversion

[sokoliva]

The metadata dictionary is now correctly propagated in both the ToProto (types.Task to a2a_pb2.Task) and FromProto (a2a_pb2.Task to types.Task) conversion utilities.

Fixes #541 🦕

[gemini-code-assist]

Summary of Changes

Hello @sokoliva, 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 a minor but important bug where task metadata was not being correctly transferred during type conversion. By adding a single line of code, it ensures that the metadata associated with a types.Task is now properly included when converting it to an a2a_pb2.Task, thereby preventing data loss and resolving the identified issue.

Highlights

• Metadata Propagation: Implemented the propagation of metadata from types.Task objects to a2a_pb2.Task objects within the task conversion method in proto_utils.py.

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[gemini-code-assist]

Code Review

This pull request correctly adds metadata propagation from types.Task to a2a_pb2.Task. While the change itself is correct, it is incomplete. The reverse conversion in FromProto.task is missing the metadata field, which will lead to data loss during a round-trip conversion. Additionally, this new functionality is not covered by unit tests. I've added a comment regarding the missing test coverage. To make this fix complete, please also update FromProto.task to handle metadata and add a round-trip test case to verify the behavior.