feat: add support for polling in FlexConnect server #692

Job	Run time
Collect changes / collect-changes	10s
Python tests / lint-and-format-check	42s
Python tests / unit-tests (py312)	6m 55s
Python tests / unit-tests (py311)	2m 43s
Python tests / unit-tests (py313)	3m 10s
Python tests / unit-tests (py310)	2m 37s
Python tests / unit-tests (py39)	3m 0s
Python tests / types-check	1m 5s
status-check	3s
	20m 25s

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