WIP: enable parallel solving for novlp setup

What does this MR do?

Parallel solving on overlapping grids has been implemented. Now we continue with non-overlapping adaptive grids.

Is there something that needs to be double checked?

• find working combination of NonOverlappingEntitySet, FEM and Constraints for GridFunctionSpace in UG case - [ ] add new template typename helper for parallel linear solvers

Can this MR be accepted?

• Implemented ...
• Added test
• Pipeline passing
• Added entry to CHANGELOG.md

Related issues

Closes #6