* remove druid datasource from the config
* remove config related references to DruidDatasource
* Update __init__.py
* Update __init__.py
* Update manager.py
* remove config related references to DruidDatasource
* raise if instance type is not valid
* chore: bump celery, Flask, flask-jwt-extended, pyJWT
* fix pyJWT breaking change
* fix pyJWT breaking change 2
* test
* fixed test
* fixed test
* fixed test
* revert since mypy won't pick the correct signature
* lint 1
* fix test
* fix test
* docs and celery config migration
* bump FAB to 4.0.0rc3, remove AUTH_STRICT_RESPONSE_CODES
* update docs for new celery config keys
* downgrade celery to 5.2.2
* ref FAB to final 4.0.0 release
* remove conflict left over
* Added code that properly accepts the -s flag on the import-datasources cli command. Also added unit tests for all of the edge cases (with both metrics & columns, with just columns, and with just metrics)
* Files were reformated using the 'pre-commit run --all-files' command
* added '*args: Any' back into v0.py as it did not need to be removed. Removing it might cause headaches for someone trying to work on this particular piece of code in the future
* Fixed the merge conflict as the cli.py was moved to another directory
* Modified my created unit tests to work with the new format of uni tests since the merge
* Modified my created unit tests to work with the new format of uni tests since the merge
* Fixed errors which were encountered while using the unit tests
