MatrixAlgebraKit decompositions #766

Job	Run time
Julia lts - macOS-latest -	33m 1s
Julia lts - ubuntu-latest -	1h 57m 6s
Julia 1 - macOS-latest -	47m 37s
Julia 1 - windows-latest -	2h 21m 43s
Julia lts - windows-latest -	2h 2m 40s
Julia 1 - ubuntu-latest -	2h 2m 33s
Julia nightly - macOS-latest -	56m 23s
Julia nightly - ubuntu-latest -	48m 5s
Julia nightly - windows-latest -	50m 58s
	12h 20m 6s

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