fix: jsonrpc client send streaming request header and timeout field

[cyy12345]

The underlying aconnect_sse library will overwrite the header and timeout of what's set in the httpx_client.

From a user using adk a2a_remote_agent library, they would pass in these information in the httpx_client. I have tried this fix in my local setup.

[gemini-code-assist]

Summary of Changes

Hello @cyy12345, 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 critical issue where the aconnect_sse library was inadvertently overwriting the httpx_client's configured timeout and headers during streaming JSON-RPC requests. By explicitly propagating these settings into the modified_kwargs, the fix ensures that client-defined network parameters are consistently applied, resolving a reported problem for users of the adk a2a_remote_agent library and maintaining expected behavior.

Highlights

• Timeout Propagation: The httpx_client's read timeout is now explicitly passed to the modified_kwargs for streaming requests, ensuring that the configured timeout is respected by the underlying aconnect_sse library.
• Header Preservation: The httpx_client's headers are now explicitly copied and passed to the modified_kwargs for streaming requests, preventing them from being overwritten by the aconnect_sse library.

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[gemini-code-assist]

Code Review

This pull request aims to fix an issue where headers and timeout from the httpx_client were not being passed to streaming requests. The implementation correctly extracts these values but has a side effect of overwriting any headers or timeout values set by interceptors. My review includes a suggestion to merge headers and use setdefault for the timeout to respect interceptor-provided values. I've also noted that the resubscribe method has a similar issue that should be addressed for consistency.