add more docs to internal compaction module #6443

Job	Run time
config	6s
Download test chain database	4s
Build (9.6.5, 3.10, ubuntu-20.04, true)	4m 40s
Build (9.6.5, 3.10, ubuntu-22.04, true)	5m 19s
Validate Devnet Database Snapshot and Replay Pact History (9.6.5, 3.10, ubuntu-20.04, true)	15s
Slow tests (9.6.5, 3.10, ubuntu-20.04, true)	10m 0s
Publish (9.6.5, 3.10, ubuntu-20.04, true)	10s
Slow tests (9.6.5, 3.10, ubuntu-22.04, true)	10m 20s
Validate Devnet Database Snapshot and Replay Pact History (9.6.5, 3.10, ubuntu-22.04, true)	25s
Benchmarks (9.6.5, 3.10, ubuntu-20.04, true)	9m 44s
Publish (9.6.5, 3.10, ubuntu-22.04, true)	15s
Benchmarks (9.6.5, 3.10, ubuntu-22.04, true)	9m 51s
Build and publish docker image (9.6.5, ubuntu-20.04, true)	1m 38s
Unit tests (9.6.5, 3.10, ubuntu-20.04, true)	5m 3s
Unit tests (9.6.5, 3.10, ubuntu-22.04, true)	5m 26s
Run Integration Tests from remote repo	1m 3s
	1h 4m 19s

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