Studio Tests

Added `DataChain.diff()` #1430

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Run time

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Job	Run time
studio (3.12, 1)	4m 47s
studio (3.12, 2)	5m 15s
studio (3.12, 3)	5m 56s
studio (3.12, 4)	12m 27s
studio (3.12, 5)	3m 31s
studio (3.12, 6)	2m 11s
	34m 7s