feat: transform roadm-paths into list indexed with frequency band #276

Job	Run time
Tests on other platforms (windows-2019, 3.10)	3m 19s
Tox test (py38)	2m 34s
Tests on other platforms (windows-2022, 3.11)	3m 3s
Tests on paywalled platforms	0s
Tox test (py39)	2m 41s
Tests on other platforms (windows-2022, 3.12)	2m 46s
Tox test (py310)	2m 39s
Tests on other platforms (macos-12, 3.11)	2m 34s
Tox test (py311)	2m 36s
Tests on other platforms (macos-13, 3.12)	2m 36s
Tox test (py312-cover)	5m 23s
Tox test (docs, graphviz)	2m 0s
Docker image	0s
PyPI packaging	0s
	32m 11s

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