Added mesh validation on import as an option. If bad mesh data is imported, there may be a crash on a switch to edit mode or similar. This adds an option to validate if a user determines the file is corrupted, allowing the possibility for data recovery. This is especially useful for importing files exported from certain CAD applications. The option here matches the option that OBJ and Alembic both provide. Co-authored-by: Charles Wardlaw <kattkieru@users.noreply.github.com> Pull Request: https://projects.blender.org/blender/blender/pulls/121054