Add list plugins method and tests #727

Job	Run time
initial_checks / Load tox environments	3s
initial_checks / codestyle (ubuntu-latest)	22s
tests / Load tox environments	8s
tests / py38-test-lts-all (ubuntu-latest)	1m 48s
tests / py39-test (ubuntu-latest)	1m 46s
tests / py310-test-all (ubuntu-latest)	1m 55s
tests / py311-test (ubuntu-latest)	1m 43s
tests / py312-test-all (ubuntu-latest)	2m 44s
tests / py38-docs (ubuntu-latest)	3m 56s
tests / py311-docs (macos-latest)	2m 3s
tests / py38-test-all (macos-12)	2m 17s
tests / py39-test (macos-12)	2m 17s
tests / py310-test-all (macos-latest)	1m 48s
tests / py311-test (macos-latest)	1m 20s
tests / py312-test-all (macos-latest)	1m 30s
tests / py38-test (windows-latest)	3m 3s
tests / py39-test (windows-latest)	3m 2s
tests / py310-test-dev-all (ubuntu-latest)	2m 25s
tests / py311-test-dev (ubuntu-latest)	2m 48s
tests / py312-test-dev-all (ubuntu-latest)	2m 34s
tests / py311-test-dev-all (macos-latest)	3m 56s
tests / py312-test-dev (macos-latest)	4m 52s
tests / py310-test-dev (windows-latest)	5m 0s
publish	0s
	53m 20s

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