Export `py_register_load_hook()` #1534

Job	Run time
OS=macOS-latest R=release py=3.11	4m 23s
OS=windows-latest R=release py=3.11	14m 7s
OS=ubuntu-latest R=release py=3.11	5m 10s
OS=macOS-latest R=oldrel py=3.11	4m 39s
OS=ubuntu-latest R=oldrel-1 py=3.10	5m 26s
OS=ubuntu-latest R=oldrel-2 py=3.10	5m 36s
OS=ubuntu-20.04 R=oldrel-3 py=3.9	5m 21s
OS=ubuntu-20.04 R=oldrel-4 py=3.9	5m 16s
OS=ubuntu-latest R=release py=3.8	5m 21s
OS=ubuntu-latest R=release py=3.9	5m 6s
OS=ubuntu-latest R=release py=3.11	4m 44s
OS=ubuntu-latest R=release py=3.12	6m 57s
OS=ubuntu-latest R=release py=3.13	4m 54s
OS=ubuntu-latest R=devel py=3.13	5m 10s
	1h 22m 10s

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