feat: add support for data source messages in FlexConnect #655

Job	Run time
Collect changes / collect-changes	6s
Python tests / lint-and-format-check	36s
Python tests / types-check	1m 5s
Python tests / unit-tests (py313)	2m 34s
Python tests / unit-tests (py312)	2m 36s
Python tests / unit-tests (py311)	2m 20s
Python tests / unit-tests (py310)	2m 21s
Python tests / unit-tests (py39)	2m 34s
status-check	1s
	14m 13s

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