Try dataset pull on large dataset and measure performance

[ilongin]

We need to make sure datachain pull works on real user scenarios.
We also need to measure performance, i.e how much overhead we are bringing if user would do just plain export - import by himself.
Datasets of 10M and larger should be tested

[ilongin]

Some times for pulling without instantiating from Studio production (team name: demo-1):

1. ds://laion_wds_1m (1M objects, 14 custom signals) : ~6k rows/sec
2. ds://laion_wds (11.5M objects, 14 custom signals) : ~6.7k rows/sec

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