removed depricated contracts

[SnickerdoodleCTO]

Release Notes

JIRA Link

Summary:

This PR will be "Version 3" of the on-chain protocol. A number of breaking changes will be created to the contract layer.

1. Removal of Crumbs contract
2. Removal of Sift Contract
3. Removal of MinimalForwarder and and EIP-2771 from protocol
4. Refactored consent contract constructor
5. Refactored optin functions with new identity commitment storage variable
6. New convenience functions for fetching all necessary consent contract information in 1 RPC request.

Intended results:

• Simpler contract architecture overall
• Hopefully cheaper to call opt in
• Support for zkp proof of membership
• less remote requests from core package to read necessary info from on-chain protocol

Potential Failures:

• potentially not any cheaper to call optin due to new identity commitment storage variable

Relevant Metrics/Indicators:

• try out npx hardhat test in contracts package to see gas profiling

Testing Notes:

• This is still a draft PR and not ready for testing yet.