[pallet-revive] allow delegate calls to non-contract accounts

[xermicus]

This PR changes the behavior of delegate calls when the callee is not a contract account: Instead of returning a CodeNotFound error, this is allowed and the caller observes a successful call with empty output.

The change makes for example the following contract behave the same as on EVM:

contract DelegateCall {
    function delegateToLibrary() external returns (bool) {
        address testAddress = 0x0000000000000000000000000000000000000000;
        (bool success, ) = testAddress.delegatecall(
            abi.encodeWithSignature("test()")
        );
        return success;
    }
}

Closes paritytech/revive#235

[xermicus]

/cmd prdoc --audience runtime_dev --bump major

[xermicus]

/cmd fmt

[pgherveou]

I think we might be missing reporting call traces for these early failure / returns
but the issue was here before this PR, will follow up in another PR if needed.