feat(PDF):Add PDF viewer (#2730)

Display DICOM encapsulated PDF documents in a PDF viewer.
Addressed the remaining PR comments, and am merging this.

platform/viewer/public/config/e2e.js

@@ -23,6 +23,7 @@ window.config = {
         supportsFuzzyMatching: false,
         supportsWildcard: true,
         staticWado: true,
+        singlepart: "video,thumbnail,pdf",
       },
     },
     // {

platform/viewer/public/config/local_static.js

@@ -23,6 +23,7 @@ window.config = {
         supportsFuzzyMatching: false,
         supportsWildcard: true,
         staticWado: true,
+        singlepart: "bulkdata,video,pdf",
       },
     },
     {