Add Identity struct with id/scopes/resources fields and IdentityProvider
trait with resolve_from_fingerprint/resolve_from_token methods. Implement
ConfigIdentityProvider reading from ArcSwap<DynamicConfig.auth> for
fingerprint-based key lookups. Delegate ServerHandler::auth_publickey()
through IdentityProvider instead of direct AuthPolicy access. Store
authenticated Identity in the handler for use by ForwardingPolicy.
glm-5.1
c64dbd19d5