* pylint: enable checks for imports
* ci: add github action for pylint
* enable pylint on pre-commit
* Install requirements
* use local pylint installation rather than of pre-commit's
* fix import errors
* more checks
* Silence unused imports
* Make a copy of dict
This avoids importing `pkg_resources` on startup, which saves around 200
ms.
NOTE: wheel installer uses its own entry points template, which is the same
fastentrypoints.py script provides, so no gain there.