Add native kron (Kronecker product) affine atom (#101) #510

Job	Run time
build (windows-latest, Debug)	9m 48s
build (macos-latest, Release)	25s
build (ubuntu-latest, Debug)	32s
build (macos-latest, Debug)	18s
build (windows-latest, Release)	11m 11s
build (ubuntu-latest, Release)	26s
	22m 40s

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