Add list plugins method and tests #730

Job	Run time
initial_checks / Load tox environments	12s
initial_checks / codestyle (ubuntu-latest)	17s
tests / Load tox environments	4s
tests / py38-test-lts-all (ubuntu-latest)	1m 42s
tests / py39-test (ubuntu-latest)	1m 52s
tests / py310-test-all (ubuntu-latest)	1m 57s
tests / py311-test (ubuntu-latest)	1m 38s
tests / py312-test-all (ubuntu-latest)	2m 21s
tests / py38-docs (ubuntu-latest)	3m 54s
tests / py311-docs (macos-latest)	2m 14s
tests / py38-test-all (macos-12)	2m 14s
tests / py39-test (macos-12)	2m 16s
tests / py310-test-all (macos-latest)	1m 23s
tests / py311-test (macos-latest)	1m 18s
tests / py312-test-all (macos-latest)	1m 26s
tests / py38-test (windows-latest)	2m 57s
tests / py39-test (windows-latest)	2m 54s
tests / py310-test-dev-all (ubuntu-latest)	2m 54s
tests / py311-test-dev (ubuntu-latest)	1m 57s
tests / py312-test-dev-all (ubuntu-latest)	2m 33s
tests / py311-test-dev-all (macos-latest)	1m 57s
tests / py312-test-dev (macos-latest)	2m 29s
tests / py310-test-dev (windows-latest)	3m 33s
publish	0s
	46m 2s

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