Message passing: allow to call contract on external chain from ZetaChain

[lumtis]

Support calling contract on external chain with message passing (Zeta CCTX) initiation from ZetaChain.

My part for supporting this would be to support custom message for the Zeta CCTX creation in evm_hook.go (this is the location where the CCTX is initiated when observing event on ZetaChain).
Currently the message is always empty

msg := types.NewMsgVoteOnObservedInboundTx(
	"",
	emittingContract.Hex(),
	senderChain.ChainId,
	txOrigin, toAddr,
	receiverChain.ChainId,
	amount,
	"",
	event.Raw.TxHash.String(),
	event.Raw.BlockNumber,
	90000,
	common.CoinType_Zeta,
	"",
	event.Raw.Index,
)

Another part of the implementation is supporting revert on ZetaChain with the message passing interface.
If the oubound observation fail and the source chain is ZetaChain, then the revert interface is used

onZetaRevert

[kingpinXD]

The onZetaRevert should be called when the original calling zEvm address is a contract.
If the original address were an account, it would make sense to mint it back to the user address. I think we can add that to the scope of this task ?

Presently. The CCTX is set to be aborted in the current logic, and nothing is refunded automatically. I am unsure if there was any specific reason for implementing it like this initially.

[lumtis]

Yes, I think we should refund the address directly in this case. We already have some logic in the code to check if it is a EOA