feat: add Streamable HTTP transport to MCPToolProvider (TS + Python) - #639

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@9a9194f87191a7e9055e3e9b95b8cfb13023bb08. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/