fix: streamable http client close on response(#266)

[4t145]

close connection on client side after received response.

Motivation and Context

fix #266

How Has This Been Tested?

Breaking Changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

cc @howardjohn

[Copilot]

Pull Request Overview

This PR fixes issue #266 by closing the client's connection after receiving a response in the streamable HTTP client.

• Added a new boolean parameter (close_on_response) to control stream closure
• Introduced a conditional break in the SSE stream loop upon receiving a response
• Updated Worker spawn calls to pass the appropriate flag based on context

Comments suppressed due to low confidence (1)

crates/rmcp/src/transport/streamable_http_client.rs:237

• Consider adding tests to verify that the SSE stream is properly closed when a response is received and close_on_response is true.

            if close_on_response && is_response {