WEB3-208: Add IRiscZeroSelectable interface

[capossele]

Thi PR introduces a new interface called IRiscZeroSelectable that leverages the already existing SELECTOR constant of the RiscZeroGroth16Verifier (and more in general of any base implementation) to abstract from the base implementation when requiring the value of its selector (e.g., during deployment).

It also adds a Makefile to quickly deploy a local devnet and fixes some printing to create a proper TOML block e.g.,

  [[chains.anvil.verifiers]]
  version = "1.2.0-alpha.1"
  selector = "0x50bd1769"
  verifier = "0x9fe46736679d2d9a65f0992f2272de9f3c7fa6e0"
  estop = "0xcf7ed3acca5a467e9e704c703e8d87f634fb0fc9"

[nategraf]

I don't think this change should be required, right? Because the SELECTOR function exists on RiscZeroGroth16Verifier

[nategraf]

I like the contents of this PR, except the Makefile, so I removed that file in 44c372b and am going to merge this PR.

My understanding is that the problem that the makefile is solving is that we need a good way to create a deployment that includes the router and associated verifiers. Instead of a Makefile, I think we should extend the functionality we have in RiscZeroCheats.sol now, and provide this as a way to create a devnet programmatically using either forge script with a script provided in this repo, or importing and using that that deploy function in a larger script, as we might be in the Boundless repo.

risc0-ethereum/contracts/src/test/RiscZeroCheats.sol

Lines 77 to 89 in 6a4eff5

	/// @notice Deploy either a test or fully verifying `RiscZeroGroth16Verifier` depending on `devMode()`.
	function deployRiscZeroVerifier() internal returns (IRiscZeroVerifier) {
	if (devMode()) {
	// NOTE: Using a fixed selector of 0 for the selector of the mock verifier.
	IRiscZeroVerifier verifier = new RiscZeroMockVerifier(bytes4(0));
	console2.log("Deployed RiscZeroMockVerifier to", address(verifier));
	return verifier;
	} else {
	IRiscZeroVerifier verifier = new RiscZeroGroth16Verifier(ControlID.CONTROL_ROOT, ControlID.BN254_CONTROL_ID);
	console2.log("Deployed RiscZeroGroth16Verifier to", address(verifier));
	return verifier;
	}
	}