객체
OAuthServerMetadata
인가 서버 메타데이터(RFC 8414, 2절).
필드
issuerstring필수authorization_endpointstring필수token_endpointstring필수revocation_endpointstring필수response_types_supportedarray of string필수grant_types_supportedarray of string필수code_challenge_methods_supportedarray of string필수token_endpoint_auth_methods_supportedarray of string필수revocation_endpoint_auth_methods_supportedarray of string필수scopes_supportedarray of string필수service_documentationstring