public static String buildMetaDataContextPathParent(final String rpcType) {
        return String.join(SEPARATOR, REGISTER_METADATA_INSTANCE_ROOT_PATH, rpcType);
    }
build child path of "/shenyu/register/metadata/{rpcType}/".

@param rpcType rpc type
@return path string
shenyu-register-center/shenyu-register-common/src/main/java/org/apache/shenyu/register/common/path/RegisterPathConstants.java