Support PDF format in Input/OutputTransformation

[marcomarsala]

Is your feature request related to a problem? Please describe.

I created a table to store passive invoices, to be administered through phpMyAdmin. I need to upload the invoice in PDF format.

Describe the solution you'd like

Allow PDF file format in Input and Output Transformation.

Describe alternatives you've considered

Currently I'm using "Text File Upload" as Input Transformation and "Download (application/octetstream)" as Output Transformation, but they doesn't show the preview like their Image Upload/Download counterparts. It would be easy to display a preview of the PDF file: 1) free native command line tools under Linux and Windows; 2) embedding an iframe

Additional context

• phpMyAdmin version: 4.6.6