Function compare_json_strings

Compare the contents of two strings in a JSON value. The strings could be either JSON string scalars encoded in utf8mb4, or binary strings from JSON opaque scalars. In either case they are compared byte by byte. @param str1 the first string @param str1_len the length of str1 @param str2 the second string @param str2_len the length of str2 @retval -1 if str1 is less than str2, @r