responseTypesSupported
@SerialName(value = "response_types_supported")
REQUIRED. JSON array containing a list of the OAuth 2.0 "response_type" values that this authorization server supports. The array values used are the same as those used with the "response_types" parameter defined by "OAuth 2.0 Dynamic Client Registration Protocol" RFC7591.
OIDC SIOPv2: MUST be id_token.