Add list plugins method and tests #765

Job	Run time
initial_checks / Load tox environments	7s
initial_checks / codestyle (ubuntu-latest)	20s
tests / Load tox environments	4s
tests / py38-test-lts-all (ubuntu-latest)	1m 43s
tests / py39-test (ubuntu-latest)	1m 37s
tests / py310-test-all (ubuntu-latest)	1m 50s
tests / py311-test (ubuntu-latest)	1m 50s
tests / py312-test-all (ubuntu-latest)	2m 13s
tests / py38-docs (ubuntu-latest)	4m 23s
tests / py311-docs (macos-latest)	2m 7s
tests / py38-test-all (macos-12)	3m 16s
tests / py39-test (macos-12)	3m 28s
tests / py310-test-all (macos-latest)	1m 53s
tests / py311-test (macos-latest)	1m 29s
tests / py312-test-all (macos-latest)	1m 32s
tests / py38-test (windows-latest)	2m 41s
tests / py39-test (windows-latest)	3m 0s
tests / py310-test-dev-all (ubuntu-latest)	3m 57s
tests / py311-test-dev (ubuntu-latest)	2m 40s
tests / py312-test-dev-all (ubuntu-latest)	3m 12s
tests / py311-test-dev-all (macos-latest)	2m 36s
tests / py312-test-dev (macos-latest)	2m 29s
tests / py310-test-dev (windows-latest)	6m 16s
publish / Build source and wheel distribution	3m 7s
	57m 50s

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