feat: implement challenge module

[forcodedancing]

Description

This pull request will add challenge module to Greenfield. The purpose is triggering data availability challenges to storage providers, and punishing storage providers if they are doing something wrong.

There are two entrances for challenging a storage provider:

1. User (called challenger) can submit Submit transactions.
2. Randomly generated challenges at EndBlocks.

The off-chain service will verify the challenge by monitoring EventStartChallenge events, comparing object hashes between storage provide side and blockchain side, and aggregating votes to attest a challenge. If Attest transaction runs correctly, the challenged storage provider will be slashed, and validators, Submit transaction creator (the challenger) if there is, Attest transaction creator (called submitter) will be rewarded.

Rationale

To support data availability challenges .

Example

NA

Changes

Notable changes:

• new messages and events

[unclezoro]

Can you clean the code because the a lot of heartbeat event and parameters still there.