Update state reader to use snapshot

[shuse2]

Description

in lisk-sdk use-case, state execution only happens once in batch, so the transactional operation is not critical.
However, if execution and read from another process happens at the same time, it might return in consistent data.

Therefore, when creating StateReader or StateReadWriter, it should create rocksdb snapshot and use that for reading data

Acceptance criteria

• Add test where read and write happen simultaneously
• All other test should pass