feat: add exections_cancellable to sdk.create and export Execution #622

Job	Run time
Collect changes / collect-changes	6s
Python tests / unit-tests (py313)	2m 54s
Python tests / unit-tests (py312)	6m 16s
Python tests / lint-and-format-check	35s
Python tests / types-check	1m 3s
Python tests / unit-tests (py311)	2m 27s
Python tests / unit-tests (py310)	2m 15s
Python tests / unit-tests (py39)	2m 49s
status-check	1s
	18m 26s

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