Notebook Text Cell Highlight Improvements (#12197)

* 1st iteration

* works but multiple highlights

* remove comment

* Works but multiple selects

* wip

* cleanup

* cleanup

* Update TPN

* Add mark.js to remote + web

* PR feedback

* Tweak workbench html files

package.json

@@ -72,6 +72,7 @@
     "jquery": "3.5.0",
     "jschardet": "2.2.1",
     "keytar": "^5.5.0",
+    "mark.js": "^8.11.1",
     "minimist": "^1.2.5",
     "native-is-elevated": "0.4.1",
     "native-keymap": "2.2.0",
@@ -193,8 +194,8 @@
     "style-loader": "^1.0.0",
     "temp-write": "^3.4.0",
     "ts-loader": "^4.4.2",
-    "typemoq": "^0.3.2",
     "tsec": "googleinterns/tsec",
+    "typemoq": "^0.3.2",
     "typescript": "^4.1.0-dev.20200824",
     "typescript-formatter": "7.1.0",
     "underscore": "^1.8.2",