feat: add exections_cancellable to sdk.create and export Execution #624

Job	Run time
Collect changes / collect-changes	5s
Python tests / types-check	1m 4s
Python tests / lint-and-format-check	33s
Python tests / unit-tests (py313)	1m 30s
Python tests / unit-tests (py312)	1m 30s
Python tests / unit-tests (py311)	1m 31s
Python tests / unit-tests (py310)	1m 31s
Python tests / unit-tests (py39)	1m 30s
status-check	1s
	9m 15s

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