handle temporary work directories

[natebrennand]

This PR adds support for creating and removing a temporary work directory. The directory is "passed" to the process through the environment variable, WORK_DIR. This is work that is currently repeated (usually inconsistently) in every one of our workers, it should be standardized to clean up our workers.

This PR also converts all log calls to use kayvee.logger.

I intend to increment the minor version (unless there's disagreement).

CC @azylman

[kvigen]

this looks good, just a few questions

[natebrennand]

Reassigning for review because last refactor was nontrivial

[kvigen]

lgtm, just the one comment about directory cleanup in the retry case