Unstructured-inference

* fix: remove pin from `onnxruntime` dependency.

* feat: add a set of new `ElementType`s to extend future element types recognition
* feat: allow registering of new models for inference using `unstructured_inference.models.base.register_new_model` function

* fix: replace `Rectangle.is_in()` with `Rectangle.is_almost_subregion_of()` when filling in an inferred element with embedded text
* bug: check for None in Chipper bounding box reduction
* chore: removes `install-detectron2` from the `Makefile`
* fix: convert label_map keys read from os.environment `UNSTRUCTURED_DEFAULT_MODEL_INITIALIZE_PARAMS_JSON_PATH` to int type
* feat: removes supergradients references

* fix: assign value to `text_as_html` element attribute only if `text` attribute contains HTML tags.

* fix: added handling in `UnstructuredTableTransformerModel` for if `recognize` returns an empty
list in `run_prediction`.

* fix: add logic to handle computation of intersections betwen 2 `Rectangle`s when a `Rectangle` has `None` value in its coordinates