feat: update onCrossChainCall with zContext

[fadeev]

Relevant: zeta-chain/node#912

[socket-security]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
@zetachain/toolkit	1.0.5-athens3	None	+0	1.61 MB	lucasjanon
@zetachain/protocol-contracts	2.0.1	None	+0	2.7 MB	lucasjanon

[andresaiello]

you can include in the pr what we talked about adding

 if (msg.sender != systemContract) {
            revert InvalidSender();
        }
        ```

[fadeev]

Added the check that the sender is system contract. I've renamed it to error SenderNotSystemContract() to make more descriptive.