support adding atoms 'zero-copy' #1618

Job	Run time
Wheel on macos-latest py-3.7	2m 34s
Checks	48s
Wheel on ubuntu-latest py-3.7	2m 27s
coverage	7m 38s
Run fuzz targets (macos-latest, 3.7)	38m 45s
Wheel on windows-latest py-3.7	4m 47s
Run fuzz targets (ubuntu-latest, 3.7)	20m 40s
Unit tests (macos-latest, 3.7)	9m 21s
Unit tests (ubuntu-latest, 3.7)	3m 20s
Unit tests (windows-latest, 3.7)	6m 32s
Upload to PyPI	21s
	1h 37m 13s

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