delete_range and delete_range_cf not implemented for TransactionDB or OptimisticTransactionDB

[mdecimus]

Methods delete_range and delete_range_cf are only available when using DB but not on TransactionDB or OptimisticTransactionDB.

[vadim-su]

Could you let me know if you found a solution?

[vadim-su]

Well, I have made the solution for OptimisticTransactionDB. Although I am not entirely sure that the solution correctly utilizes a RocksDB function, it appears to be functioning properly for my needs 44d0f98

It can't use Transaction and TransactionDB because of restrictions of the original library, but I have been able to integrate these functions for the Optimistic version of db because Optimistic contains rocksdb_t as an inner db pointer. That's why I'm not sure about properly working 😅

[mdecimus]

Could you let me know if you found a solution?

Not really, we will be manually deleting ranges until your PR gets merged. Thanks for it by the way!