Add list plugins method and tests #718

Job	Run time
initial_checks / Load tox environments	4s
initial_checks / codestyle (ubuntu-latest)	20s
tests / Load tox environments	5s
tests / py38-test-lts-all (ubuntu-latest)	1m 39s
tests / py39-test (ubuntu-latest)	1m 39s
tests / py310-test-all (ubuntu-latest)	1m 49s
tests / py311-test (ubuntu-latest)	1m 42s
tests / py312-test-all (ubuntu-latest)	2m 19s
tests / py38-docs (ubuntu-latest)	4m 7s
tests / py311-docs (macos-latest)	1m 54s
tests / py38-test-all (macos-12)	2m 18s
tests / py39-test (macos-12)	2m 18s
tests / py310-test-all (macos-latest)	1m 20s
tests / py311-test (macos-latest)	1m 23s
tests / py312-test-all (macos-latest)	1m 34s
tests / py38-test (windows-latest)	2m 54s
tests / py39-test (windows-latest)	3m 6s
tests / py310-test-dev-all (ubuntu-latest)	2m 17s
tests / py311-test-dev (ubuntu-latest)	2m 11s
tests / py312-test-dev-all (ubuntu-latest)	3m 10s
tests / py311-test-dev-all (macos-latest)	2m 3s
tests / py312-test-dev (macos-latest)	1m 56s
tests / py310-test-dev (windows-latest)	3m 45s
publish	0s
	45m 53s

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