Log the generated SQL statement

[alinz]

Hello @zombiezen,
Thanks for this repo, been using this library in my side projects for couple of months now. I have one question, Is there anyway I can get the the generated SQL statement print it out to stdout? or possibly passing a logger?

Thank you

[zombiezen]

I have been thinking of introducing a diagnostic hook for a while, but would need to do some design on what the API would look like. I'm imagining something similar to the Tracer type in David Crawshaw's package, but I would want it to:

• Have some amount of committed structure so someone who is only interested in logging SQL statements can do that without getting other diagnostics
• Be compatible with, but not depend on, OpenTelemetry (which would imply needing to be Context-aware)

[alinz]

Would love to work on that, if you need some help.