Add support for MCP HTTP Streamable and protocol version `2025-03-26`

[lbroudoux]

Reason/Context

HTTP Streamable is now an official transport protocol for MCP Server.

Description

We should implement this one as most tools (like Inspector) are moving to this transport and newer version of the MCP Protocol. This is a part of #1581

Implementation ideas

No response

[yada]

✅ Tested and validated on my side using:

• Postman MCP Client: Version 11.47.0

UI Version: 11.47.0-ui-250525-2334
Desktop Platform Version: 11.46.6 (11.46.6)

• Cherry Studio Client: Version 1.2.10 (1.2.10)

• MCP Inspector v0.13.0: v0.13.0

Both SSE and HTTP Streamable are now working as expected using the MCP client listed above 🚀

[lbroudoux]

Thanks for feedback!