Return Cardano transaction hash after successful write to blockchain

### Proposed feature

As discussed in the Community call on Jan 28th, 2025, right now the Cloud Agent does not return the transaction id/hash from the Prism Node when a successful operation has settled on chain, only the status.

For Identus applications, it would be valuable to get back not just the status, but the transaction hash, so applications can either read transaction metadata from the chain or simply link users out to a Cardano Explorer directly to prove their writes actually happened.

It was discussed in the Community call that this would be possible to add at the Cloud Agent level, since the Prism node already knows this information.

### Feature description

The existing implementation would work fine, but when a transaction completes, additionally return the transaction hash as well as the status.

### Anything else?

This feature would get used in our product instantly when it becomes available, and would reduce a large workaround we currently have to maintain. So just know this work would be both appreciated and used directly right away in a working application. Thanks in advance!