Add: Convert PDF to WebP (#1666)

* Add PDF to WebP

* add swagger param

* back

* creates a custom image for Docker from pymupdf

* Converting with pdf2image and Pillow instead of pymupdf

* webp remove to pdf-to-img

* remove mupdf

src/main/java/stirling/software/SPDF/config/EndpointConfiguration.java

@@ -166,6 +166,7 @@ public class EndpointConfiguration {
         addEndpointToGroup("Python", REMOVE_BLANKS);
         addEndpointToGroup("Python", "html-to-pdf");
         addEndpointToGroup("Python", "url-to-pdf");
+        addEndpointToGroup("Python", "pdf-to-img");
 
         // openCV
         addEndpointToGroup("OpenCV", "extract-image-scans");