optimize compressed CLVM serialization #2253

Job	Run time
Checks	50s
Wheel on macos-13 py-3.8	1m 32s
coverage	7m 21s
Wheel on ubuntu-latest py-3.8	2m 13s
Run fuzz targets (macos-13, 3.8)	25m 19s
Wheel on windows-latest py-3.8	2m 33s
Run fuzz targets (ubuntu-latest, 3.8)	20m 6s
Unit tests (macos-13, 3.8)	5m 53s
Unit tests (ubuntu-latest, 3.8)	3m 37s
Unit tests (windows-latest, 3.8)	5m 54s
Upload to PyPI	6s
	1h 15m 24s

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