Page History

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1. Physical changes to message and log to retain key and offset. This should ideally go out with 0.8 since it will be a compatibility change.
2. Change to logical offsets.
3. -Implement simple "brute force" log compaction for keyed messages
4. Nice-to-have
   1. Implement a generational compaction scheme to lessen the I/O in compaction. This is a nice to have and could be done much later.
   2. Key-based auditing