Add methods to construct a sparse CscMatrix from column-major and row-major iterators #38

Job	Run time
Build and Test (ubuntu-22.04, x86_64-unknown-linux-gnu, 1.63)	48s
Build and Test (ubuntu-22.04, x86_64-unknown-linux-gnu, stable)	19s
Build and Test (ubuntu-22.04, x86_64-unknown-linux-gnu, beta)	20s
Build and Test (ubuntu-22.04, x86_64-unknown-linux-gnu, nightly)	20s
Build and Test (macos-13, x86_64-apple-darwin, 1.63)	1m 26s
Build and Test (macos-13, x86_64-apple-darwin, stable)	50s
Build and Test (windows-2019, x86_64-pc-windows-msvc, 1.63)	1m 54s
Build and Test (windows-2019, x86_64-pc-windows-msvc, stable)	1m 5s
Build and Test (windows-2019, i686-pc-windows-msvc, 1.63)	2m 1s
Build and Test (windows-2019, i686-pc-windows-msvc, stable)	2m 0s
Build and Test (windows-2019, i686-pc-windows-msvc, beta)	1m 46s
Build and Test (windows-2019, i686-pc-windows-msvc, nightly)	1m 52s
Build and Test Succeeded	2s
	14m 43s

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