feat: Read a list of optional extra equipement files #441

Job	Run time
Tests on paywalled platforms	0s
Tests on other platforms (windows-2019, 3.10)	4m 8s
Tox test (py38)	3m 39s
Tests on other platforms (windows-2022, 3.11)	4m 27s
Tox test (py39)	3m 32s
Tests on other platforms (windows-2022, 3.12)	4m 13s
Tox test (py310)	3m 29s
Tests on other platforms (macos-13, 3.12)	4m 26s
Tox test (py311)	3m 26s
Tests on other platforms (macos-14, 3.12)	1m 54s
Tox test (py312-cover)	6m 36s
Tox test (docs, graphviz)	1m 45s
PyPI packaging	0s
Docker image	0s
	41m 35s

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