feat: auction smart contract

[quiet-node]

Optimize auction smart contract by applying either commit reveal schemes or time-based batching to mitigate Front-running attacks

• Commit reveal scheme is a technique that allows users to commit a desired actions into a hash and save it for later reveal in a separate revealing session to make sure attacker cannot predict the actions content.

• Time-based or block-based batching is a technique that batches a set of action requests, and later process after the current session is complete.