[!333] add option for already consistently oriented grids

Merge branch 'feature/already-consistent-grid-option' into 'master'

ref:extensions/dune-codegen Useful to reduce overhead when doing performance
measuring.

See merge request [extensions/dune-codegen!333]

  [extensions/dune-codegen!333]: gitlab.dune-project.org/extensions/dune-codegen/merge_requests/333