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

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

package.json

@@ -52,7 +52,6 @@
     "link-list": "npm ls --depth=0 --link=true"
   },
   "dependencies": {
-    "config-point": "^0.3.4",
     "@babel/runtime": "7.16.3",
     "core-js": "^3.2.1",
     "cornerstone-core": "2.6.0",