* Start refactoring storage logic to decouple from Flask

* Committing refactor progress; persistence abstraction is mostly complete

* Add tests for sqlalchemy persistence plugin

* blacken existing tests, delete broken docker tests

* start new config tests

* rework db session handling

* isort and clean up, more requirements

* remove commented methods in persistence plugin

* undo gitignore change

* more f-strings, type hints, exception handling

* add more sqlalchemy exception handling

* blacken recent change

* add WIP implementation of retriever runner and AA retriever

* Make a few more things async

* support accounts/arns from CLI, make swag calls async

* check and transform AA results, store to DB

* add some docstrings, handle swag failures better

* add tests for access advisor retriever

* remove old updater logic

* require python 3.8

* fix notification settings

* add progress on retriever runner tests

* add test requirements to maybe fix travis

* specify time zone on datetimes

* blacken

* use utctimetuple() instead of timetuple() for AA timestamp conversion

* add tzinfo to datetime constructors in tests

* maybe travis needs to know the time zone

* time amirite?

* add more runner tests, a bit of refactoring

* blacken, add some docstrings

* a bit of cleanup

* switch from tmpdir_factory fixture to tmp_path

* get rid of an old, irrelevant comment

Co-authored-by: Curtis Castrapel <[email protected]>