Support for OAuth Client ID Metadata Document

Expected Behavior
Spring authorization server supports "OAuth Client ID Metadata Document" described in https://datatracker.ietf.org/doc/html/draft-ietf-oauth-client-id-metadata-document-00. As it's still a draft document, it would also appreciated that, documentation describes how to extend the Client repository to support Client ID Metadata documents

Current Behavior
Spring authorization server does not have support for https://datatracker.ietf.org/doc/html/draft-ietf-oauth-client-id-metadata-document-00.

Context
I'm working on using Spring Authorization server as AS in MCP Authentication protocol.

My organization decided to not use DCR because of security risks (publicly available endpoints). Also MCP specification: https://modelcontextprotocol.io/specification/2025-11-25/basic/authorization mentions "OAuth Client ID Metadata Document" as primary way of "registering" the client and DCR as fallback being there mainly for backward compatibility reasons

I also reported that ticket in Spring authorization server board: https://github.com/spring-projects/spring-authorization-server/issues/2270

Start by reading the OAuth Client ID Metadata Document draft and the Spring Authorization Server issue 2270 linked in the report. Then inspect the current client repository extension points and related documentation in Spring Security. Done should include a decided support approach and documentation for extending the repository, if that work belongs in this project.