move node_from_number into the Allocator #1851

Job	Run time
Checks	54s
Run fuzz targets (macos-12, 3.8)	16m 28s
Wheel on macos-12 py-3.8	2m 16s
Run fuzz targets (ubuntu-latest, 3.8)	13m 27s
Unit tests (macos-12, 3.8)	7m 55s
Wheel on ubuntu-latest py-3.8	2m 46s
Unit tests (ubuntu-latest, 3.8)	3m 28s
Wheel on windows-latest py-3.8	3m 5s
Unit tests (windows-latest, 3.8)	5m 58s
coverage	8m 35s
Upload to PyPI	24s
	1h 5m 16s

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