Display 3D trajectories, with a grid interface #1538

Job	Run time
get-commit-message	5s
test-cpu (finufft)	16m 37s
test-gpu (cufinufft)	13m 12s
test-cpu (pynfft)	4m 41s
test-gpu (gpunufft)	12m 19s
test-cpu (sigpy)	4m 37s
test-gpu (torchkbnufft-gpu)	14m 43s
test-examples	23m 15s
Build API Documentation	9m 53s
coverage	23s
Compile the coverage badge in docs	0s
	1h 39m 45s

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