Minor reader bugfixes and fortified regression testing

[jamesbraza]

This PR improves consistency across readers:

• Tests equation parsing of Docling and PyMuPDF
• Renames PyMuPDF's image_dpi arg to dpi, since (1) this parameter impacts tables too and (2) it will now match other readers' DPI parameter name (e.g. Docling)
• Updates PyMuPDF reader's default DPI to unspecified, to align with PyMuPDF's default behavior
• Includes full_page in autogenerated index name hash (as full page parsing should not have a collision)
• Adds many smaller assertions: image coordinates and shapes, FileNotFoundError, expected screenshot type

[dosubot[bot]]

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