Support functions to facilitate use of hasql

[istathar]

Handling errors properly when making database calls and ensuring telemetry is sent is surprisingly tricky. This introduces helper functions which facilitate doing these things systematically.

[istathar]

I wonder if the dependency on hasql-pool is the right thing. On the one hand we've had good success using it. On the other hand resource-pool is in much better shape now. I'm trying to figure out if there's benefit to the Hasql.Pool dependency or whether using the (newly revamped) Data.Pool would be better—or whether this library should just use hasql Connection and not be involved with connection pooling at all.