Added type hints #623

Job	Run time
macOS 10.10 x86_64	23m 18s
sdist	21s
macOS 10.13 x86_64	24m 22s
Windows x86	21m 18s
macOS 10.15 x86_64	22m 42s
Windows AMD64	42m 24s
macOS arm64	23m 14s
Windows ARM64	12m 35s
manylinux2014 and musllinux x86_64	45m 15s
manylinux_2_28 x86_64	25m 52s
manylinux2014 and musllinux aarch64	55m 56s
manylinux_2_28 aarch64	35m 13s
Upload release to PyPI	0s
Upload wheels to scientific-python-nightly-wheels	0s
	5h 32m 30s

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