[Feature Request] Collate front/back image pairs into one document

Description When a scanner saves each side of a page as its own image, Paperless creates a separate document for every file when consumed. I scan one sheet and get two JPEGs, for example invoice-front.jpg and invoice-back.jpg, or another pair of endings such as scan_F.jpg and scan_B.jpg. Both files land in the consume folder. Each one is stored and OCR'd on its own, so a single physical page becomes two inbox items. I have a ScanSnap iX2500. When it saves through a computer, it can put both sides of a sheet in one PDF. The profile that writes straight to a network share cannot: there is no setting to make one PDF for a set number of pages, and no setting to merge the two sides. My share is the Paperless consume folder, so each duplex sheet arrives as two images, and Paperless files them as two documents. I want those two files to become one two-page document, front then back, without merging them by hand. The endings that mean "front" and "back" diff…