optimize compressed CLVM serialization #2252

Job	Run time
Wheel on macos-13 py-3.8	1m 34s
Wheel on ubuntu-latest py-3.8	2m 18s
Wheel on windows-latest py-3.8	2m 36s
Checks	54s
Run fuzz targets (macos-13, 3.8)	31m 10s
Run fuzz targets (ubuntu-latest, 3.8)	20m 45s
Unit tests (macos-13, 3.8)	11m 4s
Unit tests (ubuntu-latest, 3.8)	5m 20s
coverage	8m 22s
Unit tests (windows-latest, 3.8)	6m 6s
Upload to PyPI	6s
	1h 30m 15s

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