Support EIP-712 cheatcodes in Solidity Test

[kanej]

Currently the EIP-712 cheatcodes are not supported in Hardhat Solidity Test. We should explore adding targeted support for:

#[cheatcode(group = Utilities)]
function eip712HashType(string calldata typeNameOrDefinition) external pure returns (bytes32 typeHash);

#[cheatcode(group = Utilities)]
function eip712HashStruct(string calldata typeNameOrDefinition, bytes calldata abiEncodedData) external pure returns (bytes32 typeHash);

#[cheatcode(group = Utilities)]
function eip712HashTypedData(string calldata jsonData) external pure returns (bytes32 digest);