draft-ietf-oauth-identity-chaining-05

• Editorial pass on Appendix for consistency
• Clarified introduction
• Added security considerations for unconstrained authorization grants.
• Updated some contributors' affiliation and contact information
• Added examples in claims transcription text
• Simplify some text in the JWT Authorization Grant section
• Fix some toolchain complaints and other nitpicks
• Added some Privacy Considerations
• Move Mr. Parecki from acknowledgements to contributors in acknowledgement of his contributions
• Added Authorization Server Metadata registry to publish supported Token Exchange requested token types