Add support for density compensation estimation with cufinufft #1478

Job	Run time
get-commit-message	2s
test-gpu (cufinufft)	4m 28s
test-cpu (finufft)	17m 21s
test-gpu (gpunufft)	4m 47s
test-cpu (pynfft)	4m 25s
test-gpu (torchkbnufft-gpu)	1s
test-cpu (sigpy)	4m 23s
test-examples	22m 37s
Build API Documentation	0s
coverage	27s
Compile the coverage badge in docs	0s
	58m 31s

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