Installing and Testing

- Rewrite `band_structure.py` #265

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Run time

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Job	Run time
install-and-test (3.9)	39s
ruff-formatting	6s
build-and-install	33s
ruff-linting	5s
install-and-test (3.10)	41s
install-and-test (3.11)	48s
	2m 52s