Implement SEP-1442: Make MCP Stateless

[felixweinberger]

This is a tracking issue for implementation of SEP-1442.

Summary

This SEP focuses on enhancing MCP's ability to scale horizontally and operate in stateless or near-stateless modes. The Rust SDK needs to introduce patterns and protocol enhancements that allow servers to operate with minimal or no session state, enable seamless request distribution across multiple server instances, improve session handling mechanisms, optimize server startup performance, and provide guidelines for implementing stateless server architectures to support production deployments requiring high availability and horizontal scaling.

Related Issues & PRs

• Implementation PRs: n/a
• Related PRs: n/a
• Related Issues: n/a

[erenatas]

This didn't make it to last protocol release, nor it is approved, why is there a ticket on SDK for this? Same with other SEPs that have not made it to protocol