Added a standard way to define and use MCP server tools inside a CrewBase class.
This was necessary because existing methods don't work in this context due to lifecycle mismatches.
MCP tools run asynchronously and start an event loop, which causes the instance state to become desynchronized from the crew.
This change ensures proper integration by aligning the MCP server lifecycle with the CrewBase instance.
This commit includes several enhancements to the MCP integration guide:
- Adds a section on connecting to multiple MCP servers with a runnable example.
- Ensures consistent mention and examples for Streamable HTTP transport.
- Adds a manual lifecycle example for Streamable HTTP.
- Clarifies Stdio command examples.
- Refines definitions of Stdio, SSE, and Streamable HTTP transports.
- Simplifies comments in code examples for clarity.
