Read benchmarks

[parkan]

Would like to see numbers for

• Raw SQLite reads, streaming/batched (let's say batches of 200-600)
• RocksDB reads
• concat reads, streaming/batched (would need to implement multiread #31)

[autoencoder]

Perhaps also random reads, on a 100M to 500M record DB, after running

echo 1 | sudo tee /proc/sys/vm/drop_caches

:)

[parkan]

Seeing satisfactory performance here, closing for now