Rework index manipulation API #1657

Job	Run time
setup-matrix	4s
Tests (cuda, ubuntu-latest, Julia 1)	1m 1s
Tests (factorizations, ubuntu-latest, Julia 1)	1m 1s
Tests (mooncake, ubuntu-latest, Julia 1)	52s
Tests (amd, ubuntu-latest, Julia 1)	1m 3s
Tests (symmetries, ubuntu-latest, Julia 1)	1m 2s
Tests (chainrules, ubuntu-latest, Julia 1)	1m 1s
Tests (tensors, ubuntu-latest, Julia 1)	1m 22s
Tests (other, ubuntu-latest, Julia 1)	1m 1s
	8m 27s

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