feat: add exections_cancellable to sdk.create and export Execution #625

Job	Run time
Collect changes / collect-changes	5s
Python tests / types-check	1m 2s
Python tests / lint-and-format-check	35s
Python tests / unit-tests (py313)	2m 26s
Python tests / unit-tests (py312)	2m 26s
Python tests / unit-tests (py311)	2m 21s
Python tests / unit-tests (py310)	2m 19s
Python tests / unit-tests (py39)	2m 26s
status-check	1s
	13m 41s

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