OAuth 2.0 Protected Resource Metadata to the OIDC plugin

[Pantus Oleh (zibet27)]

Subsystem
Server OIDC

Motivation
KTOR-5001 Add OpenID Connect (OIDC) support on client and server

Solution

• New protectedResource(resource) { } DSL
• Serves metadata at /.well-known/oauth-protected-resource{path} derived from the resource identifier URL
• Auto-derives authorization_servers, scopes_supported, and bearer_methods_supported from configured providers unless explicitly overridden
• Bearer authentication failures include a resource_metadata parameter in WWW-Authenticate when protected resource metadata is enabled

This should be the last PR for the OIDC plugin

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