Add list plugins method and tests #722

Job	Run time
initial_checks / Load tox environments	6s
initial_checks / codestyle (ubuntu-latest)	19s
tests / Load tox environments	4s
tests / py38-test-lts-all (ubuntu-latest)	1m 54s
tests / py39-test (ubuntu-latest)	1m 38s
tests / py310-test-all (ubuntu-latest)	1m 44s
tests / py311-test (ubuntu-latest)	1m 54s
tests / py312-test-all (ubuntu-latest)	2m 26s
tests / py38-docs (ubuntu-latest)	4m 2s
tests / py311-docs (macos-latest)	1m 51s
tests / py38-test-all (macos-12)	2m 21s
tests / py39-test (macos-12)	2m 15s
tests / py310-test-all (macos-latest)	1m 28s
tests / py311-test (macos-latest)	1m 15s
tests / py312-test-all (macos-latest)	1m 59s
tests / py38-test (windows-latest)	3m 6s
tests / py39-test (windows-latest)	2m 47s
tests / py310-test-dev-all (ubuntu-latest)	2m 18s
tests / py311-test-dev (ubuntu-latest)	1m 57s
tests / py312-test-dev-all (ubuntu-latest)	2m 51s
tests / py311-test-dev-all (macos-latest)	2m 9s
tests / py312-test-dev (macos-latest)	2m 24s
tests / py310-test-dev (windows-latest)	3m 17s
publish	0s
	46m 5s

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