Add verification on keys: should be always moronically increasing #17290
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Second solution to #17247.
This solution is much simpler, and easy to understand. But it only verifies the write buffer. It doesn't verify the merged data (write and read buffer).
It also adds unnecessary sorting and deduplicating on the Key bucket, so in theory it may have a little impact on the performance. Need to run benchmark to double confirm how much performance reduction it may lead to.