Define onCall interface for ZETA token CCTX

[lumtis]

Define the interface used for ZETA

Currently for ZRC20:

interface UniversalContract {
    function onCall(MessageContext calldata context, address zrc20, uint256 amount, bytes calldata message) external;
}

Solution considered:

• Keep the same interface and using wzeta for zrc20, the argument name should be change, the behavior on ZetaChain might also be unexpected for the dev where they would preferable handle the native token directly
• Skipping the address zrc20 when calling onCall, the dev need to overload the function to support ZETA token receive
• The zero address is used for address zrc20, dev need to make a check to determine ZETA tokens are being deposited

[lumtis]

We will implement with

Skipping the address zrc20 when calling onCall, the dev need to overload the function to support ZETA token receive