Implement on-write `Chunk` compaction #11534

Job	Run time
cpp-paths-filter	7s
docs-paths-filter	5s
python-paths-filter	4s
rust-paths-filter	4s
web-paths-filter	6s
Checks / Test Python Docs	23s
Checks / Rerun lints	29s
Checks / Check if running codegen would produce any changes	1m 28s
Checks / Lint markdown	20s
Checks / Spell Check	7s
Checks / Check links	24s
Checks / Misc formatting	20s
Update PR Body / Update PR body	18s
Python Checks	0s
Minimum CLI Build / Set Config (linux-x64)	1s
Rust Checks / Rust lints (fmt, check, clippy, tests, doc)	11m 46s
Rust Checks / Test on macOS and Windows	0s
Deploy Landing Preview	0s
C++ tests	0s
Build rerun_js / Build rerun_js	3m 42s
Build web viewer / Build web viewer	2m 58s
Minimum CLI Build / Build rerun-cli (ubuntu-latest-16-cores)	4m 33s
Upload Web / Upload web build to google cloud (wasm32 + wasm-bindgen)	14s
Save PR Summary / Create HTML summary for PR	40s
Minimum Wheel Build / Set Config (linux-x64)	2s
Minimum Wheel Build / Build Wheels (ubuntu-latest-16-cores)	1m 7s
Minimum Wheel Test	0s
	29m 18s

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