feat: Add experimental plugin support #102

Job	Run time
test-contract-tests	2m 18s
test-packaging	2m 19s
test-platforms-and-versions (ubuntu-latest, 11)	2m 18s
test-platforms-and-versions (ubuntu-latest, 17)	2m 23s
test-platforms-and-versions (ubuntu-latest, 19)	2m 18s
test-platforms-and-versions (ubuntu-latest, 8)	2m 14s
	13m 50s

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