Support MCP connect, disconnect, heartbeat monitor hooks

Enterprises have internal mechanisms to authenticate with internal MCP servers. HTTP/SSE or Streamable HTTP transport based MCP servers do support Authorization: ... headers (Bearer or Basic (not really) ). In some cases non-standard headers and cookies are used.

It will be great if there are hooks for:

• Connect to MCP - this hook could generate the required headers. In fact this hook could also be used to trigger the launch of MCP server itself or whatever.
• Disconnect from MCP hook - this hook could be used to do cleanup.
• A hook to heart-beat monitor MCP server