Offchain Rollup v3 evm implementation

[h4x3rotab]

• Remove the standalone PhatRollupAnchor contract; make it a base class for the consumer contract
• Simplify role control and permission control by adding SUBMITTER_ROLE in the anchor contract
• Always use the default queue prefix
• Meta transaction in anchor (referencing EIP1271, EIP712) to decouple sender account & attest account
• Integrate v3 changes in the rollup client

Tested

• EVM hardhat integration tests
• Rollup client unit tests
• evm_price_feed unit tests

Pending: devphase integration test