Authorization + MCP Support

[rwinch]

We should see what we need to do to support authorization with MCP server.

This will likely be a cross team collaboration with Spring AI, Spring Framework, & Spring Security teams.

See https://github.com/modelcontextprotocol/modelcontextprotocol/blob/63ccd1a416de4ffe7c24d8257f8f3c849e4ea0f8/docs/specification/draft/basic/authorization.mdx