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

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

extensions/dicom-video/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ohif/extension-dicom-video",
-  "version": "0.0.1",
+  "version": "3.0.1",
   "description": "OHIF extension for video display",
   "author": "OHIF",
   "license": "MIT",