Multi-chain support in Solidity Test

[kanej]

EDR is being modified to support changing the chain type, e.g. setting it to Optimism, in Solidity Tests. This functionality needs to be exposed on the Hardhat side, this will require a small amount of design work - however, for ETHGlobal Cannes we intend a smaller change, with further alterations in the API later.

This initial move is to pass --chain-type as an option to the Solidity test task, and apply that to the EDR setup.