Implement Huber loss #3466

Job	Run time
check-typos	20s
tests (macos-13, stable, std)	10m 53s
tests (macos-13, stable, examples)	3m 0s
tests (macos-13, 1.75.0, std)	12m 58s
tests (ubuntu-22.04, stable, std)	17m 45s
tests (ubuntu-22.04, stable, no-std)	2m 49s
tests (ubuntu-22.04, stable, examples)	2m 31s
tests (ubuntu-22.04, 1.75.0, std)	7m 13s
tests (ubuntu-22.04, 1.75.0, no-std)	2m 28s
tests (windows-2022, stable, std)	8m 53s
tests (windows-2022, stable, examples)	4m 2s
tests (windows-2022, 1.75.0, std)	6m 35s
	1h 19m 27s

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