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### Summary This PR is the second part of `pdfminer` refactor to move it from `unstructured-inference` repo to `unstructured` repo, the first part is done in https://github.com/Unstructured-IO/unstructured-inference/pull/294. This PR adds logic to merge the extracted layout with the inferred layout. The updated workflow for the `hi_res` strategy: * pass the document (as data/filename) to the `inference` repo to get `inferred_layout` (DocumentLayout) * pass the `inferred_layout` returned from the `inference` repo and the document (as data/filename) to the `pdfminer_processing` module, which first opens the document (create temp file/dir as needed), and splits the document by pages * if is_image is `True`, return the passed inferred_layout(DocumentLayout) * if is_image is `False`: * get extracted_layout (TextRegions) from the passed document(data/filename) by pdfminer * merge `extracted_layout` (TextRegions) with the passed `inferred_layout` (DocumentLayout) * return the `inferred_layout `(DocumentLayout) with updated elements (all merged LayoutElements) as merged_layout (DocumentLayout) * pass merged_layout and the document (as data/filename) to the `OCR` module, which first opens the document (create temp file/dir as needed), and splits the document by pages (convert PDF pages to image pages for PDF file) ### Note This PR also fixes issue #2164 by using functionality similar to the one implemented in the `fast` strategy workflow when extracting elements by `pdfminer`. ### TODO * image extraction refactor to move it from `unstructured-inference` repo to `unstructured` repo * improving natural reading order by applying the current default `xycut` sorting to the elements extracted by `pdfminer`