test: integrate mypy into tox.ini and gitlab-ci

7 jobs for branch/default in 1 minute and 4 seconds (queued for 20 seconds)
Status Job ID Name Coverage
  Tests
passed black #34441

00:00:44

passed check-manifest #34440

00:00:21

passed flake8 #34442

00:00:56

failed mypy #34443

00:01:03

failed py3 #34438

00:00:31

failed py3-from-forge #34439

00:00:35

 
  After Tests
skipped trigger-other-pipelines #34444
 
Name Stage Failure
failed
mypy Tests
No job log
failed
py3-from-forge Tests
No job log
failed
py3 Tests
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