Moving least squares (extra fixes)

[mrlag31]

This adds miscellaneous fixes for #946. Those are the fixes in no particular order:

• New lines at the end of files
• Using AccessValues instead of AccessTraits
• Rework of internal MovingLeastSquares class
  • Usage of callbacks to create the indices and source_view views
• Removing unnecessary KOKKOS_FUNCTION and KOKKOS_INLINE_FUNCTION
• Removing slice_lengths static reference in evaluatePolyBasis
• Renaming types and acronyms
• Templation of CRBFs on the point type
  • New template parameter that takes the dimension
  • New global function that evaluates a CRBF on a point and with a specific radius.

This PR is here to discuss how to split off the changes and track them. It is not for immediate merge.

[mrlag31]

This is also the base for two extra features

• The distributed interface (https://github.com/mrlag31/ArborX/tree/mls-distributed)
• The optimized coefficients computation (https://github.com/mrlag31/ArborX/tree/mls-coefficients-on-scratch-pad)