Add state duration extraction and alert filtering #54

Job	Run time
Build distribution packages	13s
Test with nox (ubuntu-20.04, 3.11, ci_checks_max)	53s
Test with nox (ubuntu-20.04, 3.11, pytest_min)	30s
Cross-arch tests with nox	0s
Test documentation website generation	28s
Cross-arch tests with nox	0s
Test package installation in different architectures	1m 47s
Test with nox	1s
Publish documentation website to GitHub pages	0s
Create GitHub release	0s
Publish packages to PyPI	0s
	3m 52s

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