Implement the MCP server Streamable HTTP transport for the Pydantic AI MCP client

[demux79]

Description

Thank you for your great work on Pydantic AI. I noticed that your MCP client documentation reads:
The name "HTTP" is used since this implemented will be adapted in future to use the new [Streamable HTTP](https://github.com/modelcontextprotocol/specification/pull/206) currently in development.

The provided link shows that the implementation was completed by fastmcp in March. Would be great to support it in Pydantic AI.

References

modelcontextprotocol/modelcontextprotocol#206
https://ai.pydantic.dev/mcp/client/

[DouweM]

Done in #1716, about to be released!

[demux79]

Awesome, sorry, I had only searched in the open issues.