Add list plugins method and tests #814

Job	Run time
initial_checks / Load tox environments	9s
initial_checks / codestyle (ubuntu-latest)	27s
tests / Load tox environments	7s
tests / py310-test-all (ubuntu-latest)	10m 11s
tests / py311-test (ubuntu-latest)	8m 57s
tests / py312-test-all (ubuntu-latest)	14m 41s
tests / py310-docs (ubuntu-latest)	2m 55s
tests / py311-docs (macos-latest)	2m 4s
tests / py310-test-all (macos-latest)	5m 44s
tests / py311-test (macos-latest)	5m 49s
tests / py312-test-all (macos-latest)	8m 59s
tests / py310-test (windows-latest)	11m 58s
tests / py312-test-all (windows-latest)	18m 27s
tests / py311-test-dev-all (ubuntu-latest)	11m 22s
tests / py312-test-dev (ubuntu-latest)	13m 25s
tests / py313-test-dev-all (ubuntu-latest)	13m 39s
tests / py311-test-dev (macos-latest)	7m 17s
tests / py312-test-dev-all (macos-latest)	9m 47s
tests / py313-test-dev (macos-latest)	6m 34s
tests / py311-test-dev-all (windows-latest)	14m 34s
tests / py313-test-dev (windows-latest)	14m 40s
publish / Build source and wheel distribution	15m 43s
	3h 17m 29s

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