chore: add contracts_utils (#502) #391

Job	Run time
lint / lint	1m 51s
lint / lint	1m 51s
stateful-tests (test_all.py)	5h 59m 43s
stateful-tests (test_all.py)	5h 59m 43s
stateful-tests (test_keyManager.py)	31m 24s
stateful-tests (test_keyManager.py)	31m 24s
stateful-tests (test_vault.py)	1s
stateful-tests (test_vault.py)	2h 29m 11s
stateful-tests (test_stateChainGateway.py)	1h 4m 41s
stateful-tests (test_stateChainGateway.py)	1h 4m 41s
stateful-tests (test_upgradability.py)	49m 48s
stateful-tests (test_upgradability.py)	49m 48s
	19h 24m 6s

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