Add support for `eigvals`, `svdvals` and `diag`, `diagm`. (#130) #241

Job	Run time
Julia 1.6 - ubuntu-latest - x64	35m 11s
Julia 1.6 - macOS-latest - x64	26m 19s
Julia 1.6 - windows-latest - x64	42m 23s
Julia 1 - ubuntu-latest - x64	29m 0s
Julia 1 - macOS-latest - x64	28m 18s
Julia 1 - windows-latest - x64	31m 53s
Julia nightly - ${{ matrix.os }} - ${{ matrix.arch }}	0s
	3h 13m 4s

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