Add frequency dependency on ROADM impairments #365

Job	Run time
Tests on other platforms (windows-2019, 3.10)	4m 57s
Tests on other platforms (windows-2022, 3.11)	4m 8s
Tests on other platforms (windows-2022, 3.12)	5m 12s
Tox test (py38)	3m 18s
Tests on other platforms (macos-12, 3.11)	3m 30s
Tests on paywalled platforms	0s
Tox test (py39)	3m 28s
Tests on other platforms (macos-13, 3.12)	5m 2s
Tox test (py310)	3m 19s
Tox test (py311)	3m 4s
Tox test (py312-cover)	6m 23s
Tox test (docs, graphviz)	1m 44s
Docker image	0s
PyPI packaging	0s
	44m 5s

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