1. Add testdata, move the existing test data to zstd-compressed format.
2. Add benchmarks in qlist_test that add lots of records, forcing compression of inner noded,
or read compressed list checking the decompression.
Currently qlist uses valkey compression algorithm.
On my machine:
1. (valkey) Compression is 5 times slower than no compression.
2. Decompression is 37 times slower.
Signed-off-by: Roman Gershman <roman@dragonflydb.io>
