Add list plugins method and tests #717

Job	Run time
initial_checks / Load tox environments	4s
initial_checks / codestyle (ubuntu-latest)	19s
tests / Load tox environments	4s
tests / py38-test-lts-all (ubuntu-latest)	1m 38s
tests / py39-test (ubuntu-latest)	1m 45s
tests / py310-test-all (ubuntu-latest)	1m 50s
tests / py311-test (ubuntu-latest)	1m 41s
tests / py312-test-all (ubuntu-latest)	2m 12s
tests / py38-docs (ubuntu-latest)	4m 5s
tests / py311-docs (macos-latest)	1m 58s
tests / py38-test-all (macos-12)	2m 25s
tests / py39-test (macos-12)	2m 19s
tests / py310-test-all (macos-latest)	1m 18s
tests / py311-test (macos-latest)	1m 35s
tests / py312-test-all (macos-latest)	1m 50s
tests / py38-test (windows-latest)	2m 50s
tests / py39-test (windows-latest)	3m 4s
tests / py310-test-dev-all (ubuntu-latest)	2m 59s
tests / py311-test-dev (ubuntu-latest)	2m 15s
tests / py312-test-dev-all (ubuntu-latest)	2m 39s
tests / py311-test-dev-all (macos-latest)	2m 24s
tests / py312-test-dev (macos-latest)	2m 39s
tests / py310-test-dev (windows-latest)	3m 54s
publish	0s
	47m 47s

Provide feedback