Function librocksdbsys::crocksdb_user_collected_properties_add

pub unsafe extern "C" fn crocksdb_user_collected_properties_add(
    props: *mut DBUserCollectedProperties, 
    key: *const uint8_t, 
    key_len: size_t, 
    value: *const uint8_t, 
    value_len: size_t
)