Add transfer status query API

[jonator]

Example testnet query

Problem

Currently, developers are in the dark when it comes to querying the transfer status of a transaction. For me at Osmosis, I had to reverse engineer Axelar scan to get a sense of the various transfer states.

Requirements

• Add a query API for getting the status of a transfer given the hash of a deposit address send transaction.
• By default, the API should return a clean user-facing interface for the various states, similar to that seen on Axelar scan. Currently, developers have to make a lot of assumptions about how the various states are represented by the query return values over the duration of the transfer. This results in a buggy result for the developer.