Add implementation of make_getter (removed from astropy) #447

Job	Run time
Code style checks	23s
Code style checks	54s
Python 3.10 with minimal dependencies and coverage	30s
Python 3.10 with minimal dependencies and coverage	4m 15s
Python 3.9	27s
Python 3.9	4m 14s
Python 3.10	15s
Python 3.10	4m 15s
Python 3.11	25s
Python 3.11	4m 14s
Python 3.10 with all optional dependencies	22s
Python 3.10 with all optional dependencies	4m 14s
Python 3.10 without GSL	25s
Python 3.10 without GSL	4m 15s
Python 3.9 with oldest supported version of all dependencies	25s
Python 3.9 with oldest supported version of all dependencies	4m 15s
Python 3.10 standard tests (macOS)	35s
Python 3.10 standard tests (macOS)	3m 58s
	38m 21s

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