GatewayZEVM : Add Gas price to event

[kingpinXD]

We should add GasPrice to the withdraw event

    emit Withdrawn(
            msg.sender,
            0,
            receiver,
            zrc20,
            amount,
            gasFee,
            IZRC20(zrc20).PROTOCOL_FLAT_FEE(),
            "",
            CallOptions({ gasLimit: IZRC20(zrc20).GAS_LIMIT(), isArbitraryCall: true }),
            revertOptions
        );

We can calculate the price on the protocol side , as all events are processed in the same block , but it might be easier to emit the gasPrice paid by the user when creating the withdraw

NOTE : The gas-price when finalizing the TX might be different (more) than what the user paid for

[lumtis]

NOTE : The gas-price when finalizing the TX might be different (more) than what the user paid for

Not sure how, because the even is parsed in the same Cosmos tx where the evm tx is done so everything is done atomically

[kingpinXD]

The price is adjusted by the protocol if the CCTX gets stuck
https://github.com/zeta-chain/zeta-node/blob/ffd267a63c7cc55c26c94183efa375d4be2a3a2e/x/crosschain/keeper/abci.go#L200-L204

The additional gas tokens are borrowed from the stability pool .

This requirement is good to have , this pr already adds a workaround by setting the price whne the cctx is creatred
zeta-chain/node#3734