- Added dynamic client registration support in the OAuth service, implementing RFC 7591 for automatic client registration.
- Introduced methods for generating client IDs and secrets, validating registration requests, and creating client information.
- Enhanced authorization flow by validating client requests, redirect URIs, and response types.
- Implemented token management features, including token introspection, token exchange, and refresh token handling.
- Improved security with state parameter generation and validation, as well as code challenge methods for PKCE.
- Updated endpoint discovery and server metadata retrieval to include new features and capabilities.
- Deleted the OAuth interface and related types that were previously defined in the `interfaces.go` and `types.go` files, streamlining the codebase.
- Updated the `oauth.go` file to integrate user and client providers directly, enhancing the service's functionality and reducing complexity.
- Refactored the user information retrieval method to utilize the new user provider structure, ensuring compatibility with the updated architecture.
