[bench] A serial single-thread in-memory execution engine

[gdanezis]

This is a test to see how fast we can actually execute transactions in single threaded move, if we remove most of the the systems overhead. To this end this branch opens a DB with existing checkpoints, reads the summaries, contents and transactions serially from the DB (in a blocking way), and executes all transactions sequentially on one thread, using a HashMap as a DB back-end.

The performance we get on my (rather underpowered) Linux laptop is:

$ cargo run --release --bin sui-node -- --config-path fullnode.yaml
Load checkpoint: 102158 TPS: 2937.151248164464
Load checkpoint: 108066 TPS: 2820.7440811724914
Load checkpoint: 113759 TPS: 2926.29423808131
Load checkpoint: 119459 TPS: 3145.5974842767296

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