Display 3D trajectories, with a grid interface #1542

Job	Run time
get-commit-message	4s
test-cpu (finufft)	19m 9s
test-gpu (cufinufft)	14m 42s
test-gpu (gpunufft)	15m 31s
test-cpu (pynfft)	4m 30s
test-gpu (torchkbnufft-gpu)	15m 26s
test-cpu (sigpy)	4m 41s
Build API Documentation	10m 23s
test-examples	27m 2s
coverage	24s
Compile the coverage badge in docs	0s
	1h 51m 52s

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