fixed bug in nano::rocksdb::store::clear() #4279
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Addresses #3911 - issue before was that the function was deleting the column entirely to clear the contents then adding it back. This solution makes use of the atomic update feature in RocksDB by creating a batch of delete operations for all keys in the column and applying them with a write operation. This approach ensures that either all operations are applied or none are, thus guaranteeing database consistency.