Adding necessary changes for staggered scheme#4

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TheoChristo wants to merge 3 commits intomgroupntua:developfrom TheoChristo:develop

Commits on Jul 21, 2022

Adding LU Solver
TheoChristo
committed

Commits on Sep 22, 2022

Adding Dense Matrix Non-Symmetric solver and updated CheckCompatibility to support staggered scheme
TheoChristo
committed

Commits on Sep 23, 2022

Merging changes from mgroupntua/Solvers
TheoChristo
committed