feat: Agent graph support #544

Job	Run time
test-platforms-and-versions (ubuntu-latest, 8)	3m 58s
test-contract-tests	4m 24s
test-packaging	1m 56s
test-platforms-and-versions (ubuntu-latest, 11)	4m 5s
test-platforms-and-versions (ubuntu-latest, 19)	3m 44s
test-platforms-and-versions (ubuntu-latest, 17)	3m 44s
	21m 51s

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