Add list plugins method and tests #762

Job	Run time
initial_checks / Load tox environments	6s
initial_checks / codestyle (ubuntu-latest)	24s
tests / Load tox environments	7s
tests / py38-test-lts-all (ubuntu-latest)	1m 42s
tests / py39-test (ubuntu-latest)	1m 38s
tests / py310-test-all (ubuntu-latest)	1m 52s
tests / py311-test (ubuntu-latest)	1m 42s
tests / py312-test-all (ubuntu-latest)	2m 20s
tests / py38-docs (ubuntu-latest)	4m 3s
tests / py311-docs (macos-latest)	2m 43s
tests / py38-test-all (macos-12)	3m 5s
tests / py39-test (macos-12)	3m 10s
tests / py310-test-all (macos-latest)	1m 32s
tests / py311-test (macos-latest)	1m 27s
tests / py312-test-all (macos-latest)	1m 45s
tests / py38-test (windows-latest)	2m 20s
tests / py39-test (windows-latest)	2m 31s
tests / py310-test-dev-all (ubuntu-latest)	3m 1s
tests / py311-test-dev (ubuntu-latest)	2m 45s
tests / py312-test-dev-all (ubuntu-latest)	3m 12s
tests / py311-test-dev-all (macos-latest)	2m 46s
tests / py312-test-dev (macos-latest)	2m 22s
tests / py310-test-dev (windows-latest)	4m 2s
publish	0s
	50m 35s

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