Measure timings

[bumi]

It would be interesting to learn how fast we get a reply from the wallet. This helps us to optimize the product and understand how fast things generally are.

I am not sure if this can be done with some datadog instrumentation or if the echo logs with timings are enough.
Alternatively we can add a manual timing entry to the log (starting a timer when we publish the message and log the time once we receive the reply)