Improve permuted layout/view construction

[artv3]

Is your feature request related to a problem? Please describe.

Constructing a permuted layout can be cumbersome. For example the following will create a permuted layout and identify unit stride.

std::array<RAJA::idx_t, 3> perm3a {{2, 1, 0}};                                                                                                                                                                                           
RAJA::Layout< 3, int> perm3a_layout =                                                                                                                                                                                                    
RAJA::make_permuted_layout( {{Nx, Ny, Nz}}, perm3a);                                                                                                                                                                                   
RAJA::View< int, RAJA::Layout<3, int, 0> > perm3a_view_3D(a, perm3a_layout);

Experiments have shown that specifying unit stride on the Layout used when making a permuted layout object does not effect index calculation only the one in the View.

Describe the solution you'd like

A simpler approach to constructing such a view