Badger Sorted Writer Performance for Compression

Command Ran: go build . && ./badger benchmark write -s -k=64 -v=16 -m=250 --dir /mnt/nvme/test-snappy

The test deliberately avoids touching vlog.

Disk Usage:

$ du -sh test*
9.3G	test (no compression, Time Taken: 50s)
3.0G	test-snappy (Time: 55s)
1.8G	test-zstd-1  (Time: 60s, with compression level 1)

CC: @ibrahim

This test should give users an idea about the tradeoffs of compression.