feat: add Snowflake key-pair auth support #711

Job	Run time
Collect changes / collect-changes	10s
Python tests / types-check	1m 8s
Python tests / lint-and-format-check	41s
Python tests / unit-tests (py311)	2m 30s
Python tests / unit-tests (py313)	3m 18s
Python tests / unit-tests (py39)	2m 55s
Python tests / unit-tests (py310)	2m 28s
Python tests / unit-tests (py312)	4m 37s
status-check	2s
	17m 49s

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