Improve server logs for block errors

[jdbocarsly]

Currently, block errors are nicely caught by the base datablock (base.py), allowing errors and warnings to be displayed in the frontend. However, this catching means that the log always reports all errors as coming from the file base.py, instead of the file/line where the error actually occurred.

For example:

It would improve DX to log more informative information about where the error originated.

[ml-evs]

Good suggestion, I have a branch playing around with this already (can't remember if I pushed it). I think what needs to be done for logging is removing the "base" logger (which also pollutes all blocks with having to load the server config) and replace it with module-local logging that adopts the server settings when they are configured. We might also want to look at generally switching to something like https://www.structlog.org/en/stable/index.html for this.

[jdbocarsly]

I put in enough to get through basic block development in #1393, just making sure the info is at least there.