MatrixAlgebraKit decompositions #670

Job	Run time
Julia lts - macOS-latest -	23m 25s
Julia 1 - macOS-latest -	30m 31s
Julia lts - ubuntu-latest -	1h 15m 1s
Julia 1 - ubuntu-latest -	1h 32m 24s
Julia 1 - windows-latest -	1h 36m 44s
Julia lts - windows-latest -	1h 24m 2s
Julia nightly - ubuntu-latest -	51m 27s
Julia nightly - macOS-latest -	31m 52s
Julia nightly - windows-latest -	49m 50s
	8h 55m 16s

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