Worker: Get the message status from message outbox of the gateway.

[deepesh-kn]

This is an implementation ticket. The actual implementation may vary as we start working on it.
Please check #5 first for any updates in interface and params.

This function is to get the message status from the outbox of messageBox in origin chain (source).
This will be used by the worker to check the latest status of the facilitation from the chain before it performs the actual stake and mint facilitation.