feat: add Snowflake key-pair auth support #712

Job	Run time
Collect changes / collect-changes	9s
Python tests / types-check	1m 4s
Python tests / lint-and-format-check	38s
Python tests / unit-tests (py312)	6m 47s
Python tests / unit-tests (py313)	3m 16s
Python tests / unit-tests (py311)	2m 33s
Python tests / unit-tests (py310)	2m 31s
Python tests / unit-tests (py39)	2m 56s
status-check	3s
	19m 57s

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