CSV insertions for database for better benchmarking

[sirupsen]

Currently if you run the benchmarking scripts (see README and #135) it's very slow against the cloud databases. It would be better to use CSV imports for the cloud databases (redshift, bigquery, oracle, snowflake) by doing something similar to dev/_bq_import_csv.py in _insert_to_table.

It will work today for 100M rows, but it'll be very slow...

[github-actions]

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[github-actions]

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