Add an implementation of BLOCK-MINRES #1706

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - pull_request	7m 10s
Julia 1.6 - macos-latest - x64 - pull_request	6m 40s
Julia 1.6 - windows-latest - x64 - pull_request	16m 5s
Julia 1 - ubuntu-latest - x64 - pull_request	11m 49s
Julia 1 - macos-latest - x64 - pull_request	15m 12s
Julia 1 - windows-latest - x64 - pull_request	12m 36s
Julia 1 - macos-latest - arm64 - pull_request	8m 43s
Julia nightly - ubuntu-latest - x64 - pull_request	15m 26s
Julia nightly - macos-latest - x64 - pull_request	9m 51s
Julia nightly - windows-latest - x64 - pull_request	11m 12s
	1h 54m 44s

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