Adding stubs and making mypy pass #97

Job	Run time
Make sure submodule is in a sane state / Make sure submodule is in a sane state	28s
Code-quality checks / Run linting and formatting	13s
Build a minimal set of packages and run all tests on them / Build an sdist and determine versions / Build sdist	21m 51s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp313-win_amd64	45m 25s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp313-manylinux_aarch64	19m 7s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp39-manylinux_aarch64	18m 42s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp313-manylinux_x86_64	24m 19s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp39-win_amd64	46m 56s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp39-macosx_arm64	28m 1s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp39-macosx_x86_64	45m 16s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp313-macosx_x86_64	38m 46s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp39-manylinux_x86_64	24m 4s
Build a minimal set of packages and run all tests on them / Build and test releases / Wheel: cp313-macosx_arm64	19m 17s
Run coverage tests	-1s
	5h 32m 24s

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