Add DPI setting for image extraction

Hi Team,

As of now I can only see the option to increase the image scale during extraction through the PdfPipelineOptions().images_scale parameter.

Could you please tell me if there is an option to increase the dpi of the images which are extracted? I find that they are much lower resolution than what can be seen on the original PDF.

Many thanks

Start with PdfPipelineOptions().images_scale and trace how image extraction uses that setting. Determine where a DPI option belongs and verify that extracted images can be produced at the requested resolution while preserving the existing scale behavior.

Written by the indexing model from the issue text.