Make EvaP pip-installable and publish to PyPI #3901

Job	Run time
Build wheel	1m 41s
Formatting	1m 35s
Build nix environment on MacOS	3m 45s
Linter	2m 9s
MyPy	1m 39s
Test + Coverage	3m 2s
Test (shuffled order)	2m 28s
Test Frontend	3m 13s
Test if testdata is up to date	2m 6s
Test Typescript	1m 37s
Backup process	1m 8s
Install wheel with system Python	11s
	24m 34s

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