Test snapshot isolation #729
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In-memory LSM wasn't correctly setting the tx on the compacted part
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Adds a unit test that artificially causes a race between snapshots and compactions to cause newer data than the snapshot tx to end up in the snapshot.
However due to index insert writes rejecting inserts with a tx less than what's already been inserted it ensures that we don't end up with duplicate data.
There was a bug with the in-memory LSM that this test found and was fixed. It wasn't correctly setting the compaction tx.