Redo import perf

[max-hoffman]

New import tests. Refer to README for usage details.

[max-hoffman]

#import-benchmark

[github-actions]

@max-hoffman workflow run: https://github.com/dolthub/dolt/actions/runs/3440240123

[github-actions]

@max-hoffman LD_1

name	program	version	from_time	from_rps	program	version	to_time	to_rps	rps_multiplier
100k-sorted.csv	dolt	3bbc0e6	13.64s	7331.9	dolt	a72fb93	13.63s	7334.2	1.0
100k-random.csv	dolt	3bbc0e6	13.81s	7240.2	dolt	a72fb93	13.78s	7257.1	1.0
1m-sorted.csv	dolt	3bbc0e6	2m36.69s	6382.2	dolt	a72fb93	2m35.45s	6432.8	1.0
1m-random.csv	dolt	3bbc0e6	2m36.36s	6395.4	dolt	a72fb93	2m35.77s	6419.7	1.0
10m-sorted.csv	dolt	3bbc0e6	29m9.39s	5716.3	dolt	a72fb93	29m2.3s	5739.5	1.0
10m-random.csv	dolt	3bbc0e6	29m4.71s	5731.6	dolt	a72fb93	28m59.91s	5747.4	1.0

[github-actions]

@max-hoffman DOLT

name	program	version	from_time	from_rps	program	version	to_time	to_rps	rps_multiplier
100k-sorted.csv	dolt	3bbc0e6	16.5s	6061.1	dolt	a72fb93	16.39s	6100.5	1.0
100k-random.csv	dolt	3bbc0e6	16.7s	5989.8	dolt	a72fb93	16.56s	6039.4	1.0
1m-sorted.csv	dolt	3bbc0e6	2m43.27s	6124.9	dolt	a72fb93	2m44.06s	6095.4	1.0
1m-random.csv	dolt	3bbc0e6	2m44.25s	6088.3	dolt	a72fb93	2m44.14s	6092.5	1.0
10m-sorted.csv	dolt	3bbc0e6	27m55.4s	5968.7	dolt	a72fb93	28m9.98s	5917.2	1.0
10m-random.csv	dolt	3bbc0e6	28m0.42s	5950.9	dolt	a72fb93	28m7.12s	5927.3	1.0