fix(Mypy): add support for type checking #82

Job	Run time
test / prepare / prepare	13s
test / checkers	17s
test / test-repository / test-python (windows-latest)	1m 53s
test / test-repository / test-python (ubuntu-latest)	52s
test / semantic-commit / semantic-commit	33s
test / test-repository / test-npm (ubuntu-latest)	17s
test / test-repository / test-npm (windows-latest)	49s
test / test-repository / test-docker	0s
test / release	0s
test / deploy-repository	0s
	4m 54s

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