SEP-1036: URL Mode Elicitation for secure out-of-band interactions

[Kehrlann]

This is a tracking issue for modelcontextprotocol/modelcontextprotocol#887

[embesozzi]

It would be a valuable feature to support out-of-band interactions in the context of authentication or JIT authorization for users with the OAuth 2.0 Device Authorization Grant [1]

[1] https://datatracker.ietf.org/doc/html/rfc8628