feat: add metadata to send message request

[yarolegovich]

Extended client.send_message to take metadata parameter which gets attached to MessageSendParams.

BEGIN_COMMIT_OVERRIDE
fix: add metadata to send message request
END_COMMIT_OVERRIDE

[gemini-code-assist]

Summary of Changes

Hello @yarolegovich, 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 significant enhancement by enabling the attachment of custom metadata to messages sent through the client.send_message interface. This provides a flexible mechanism for extending message capabilities without altering core message structures, allowing for more contextual and dynamic message processing.

Highlights

• New Feature: Message Metadata: The client.send_message function now accepts an optional request_metadata parameter, allowing users to attach arbitrary key-value data to outgoing messages.
• Parameter Propagation: The provided request_metadata is passed through to the MessageSendParams object, ensuring it is associated with the message sending request.
• API Updates: The send_message function signatures in both src/a2a/client/base_client.py and src/a2a/client/client.py have been updated to include the new request_metadata parameter.
• Test Coverage: New test cases have been added to tests/client/test_base_client.py to verify that the request_metadata is correctly handled and attached for both streaming and non-streaming message scenarios.

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[gemini-code-assist]

Code Review

This pull request successfully adds a metadata parameter to the send_message method, propagating it to MessageSendParams. The changes are implemented correctly in both the abstract Client and the BaseClient implementation. The tests have been updated to verify this new functionality in both streaming and non-streaming modes. My feedback includes a couple of minor stylistic suggestions to improve code conciseness in the test files.