Display 3D trajectories, with a grid interface (#193) #1557

Job	Run time
get-commit-message	3s
test-cpu (finufft)	19m 19s
test-gpu (cufinufft)	15m 6s
test-cpu (pynfft)	4m 40s
test-gpu (gpunufft)	15m 46s
test-cpu (sigpy)	4m 52s
test-gpu (torchkbnufft-gpu)	15m 13s
test-examples	26m 12s
Build API Documentation	9m 58s
coverage	28s
Compile the coverage badge in docs	13s
	1h 51m 50s

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