### Summary
Address
[#1136](https://github.com/Unstructured-IO/unstructured/issues/1136) for
`hi_res` and `fast` strategies. The `ocr_only` strategy does not include
coordinates.
- add functionality to switch sort mode between the current `basic`
sorting and the new `xy-cut` sorting for `hi_res` and `fast` strategies
- add the script to evaluate the `xy-cut` sorting approach
- add jupyter notebook to provide evaluation and visualization for the
`xy-cut` sorting approach
### Evaluation
```
export PYTHONPATH=.:$PYTHONPATH && python examples/custom-layout-order/evaluate_xy_cut_sorting.py <file_path> <strategy>
```
Here, the file should be under the project root directory. For example,
```
export PYTHONPATH=.:$PYTHONPATH && python examples/custom-layout-order/evaluate_xy_cut_sorting.py example-docs/multi-column-2p.pdf fast
```
* chore: CFR double column sample
Federal Regulations document for example notebook in `examples/custom-layout-order`
* chore: custom-layout-order example dir
* feat: helper methods to plot and reorder layouts
Helper methods: `plot_image_with_bounding_boxes_coloured` and `reorder_elements_in_double_columns`
* chore: delete __init__.py
---------
Co-authored-by: Benjamin Torres <benjats07@users.noreply.github.com>
