New InitializedResetter contract

[maurelian]

Following #13071, we will be able to simplify the process of resetting contracts initialized value, as they will all use the same slot. Therefore a purpose build version of the StorageSetter can be implemented.

contract InitializedResetter {

	// keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
	bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;
	
	function reset() external {
	    // Write 0 to the initializer slot
	    assembly {
	        sstore(INITIALIZABLE_STORAGE, 0)
	    }
	}
}

Note: this won't work until after the Isthmus upgrade.