Make EvaP pip-installable and publish to PyPI #3917

Job	Run time
Build wheel	1m 42s
Test if testdata is up to date	2m 6s
MyPy	1m 39s
Test + Coverage	2m 58s
Test Frontend	3m 18s
Test (shuffled order)	2m 28s
Test Typescript	1m 49s
Formatting	1m 33s
Linter	2m 13s
Build nix environment on MacOS	3m 43s
Install wheel with system Python	11s
Backup process	2m 14s
	25m 54s

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