Refs #10250 Remove python Stitch1DMany
Refs #10250 Add C++ Stitch1DMany stub
Refs #10250 Add basic input validation
Refs #10250 Add basic stitching implementation
Refs #10250 Re-add Stitch1DMany python test
Refs #10250 Add support for processing groups
Merge remote-tracking branch 'origin/feature/10250_move_stitch1dmany_to_cpp'