Save and load test sets from Parquet files #248

Job	Run time
Code style	1m 10s
Coverage	1m 22s
Test ubuntu-latest with Python 3.9	1m 4s
Test ubuntu-latest with Python 3.10	1m 3s
Test ubuntu-latest with Python 3.11	1m 5s
Test macos-latest with Python 3.9	1m 31s
Test macos-latest with Python 3.10	59s
Test macos-latest with Python 3.11	1m 7s
Test windows-latest with Python 3.9	2m 10s
Test windows-latest with Python 3.10	2m 31s
Test windows-latest with Python 3.11	2m 19s
	16m 21s

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