Generalization classes for FITS cutouts #713

Job	Run time
Code style checks	32s
Python 3.9 with minimal dependencies	2m 36s
(Allowed Failure) Python 3.11 with dev version of key dependencies	7m 3s
Python 3.9 with all optional dependencies	2m 40s
Python 3.10 with numpy 1.23 and full coverage	3m 43s
Python 3.10 with all optional dependencies (MacOS X)	2m 1s
Python 3.10 with numpy 2	2m 44s
	21m 19s

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