refactor validator codebase

[chetna-mittal]

Description

List of changes to be done:

• Refactor the validator codebase to make it more modular
• Change the Data Market Address in config to include an array of addresses
• Append the Data Market Address to all the redis keys
• Change the Batch structure to the one that is currently stored in IPFS and accordingly modify the code around it
• Add logic for batch attestation (retrieving batch from IPFS, building a merkle tree with finalized CIDs and getting the root hash of the tree which would be used for verification)
• Add relayer transaction service support to submit the batch attestations to the Protocol State Contract.

[anomit]

Will be taken up separately as a broader scope task for architectural discussion before moving into implementation.