feat: enable the use of TypeScript in this repo (#604)

* feat: enable Typescript in this repo

* refactor: rename studio-header files to .ts[x]

* chore: fix minor type warnings

* chore: add types for frontend-platform

* chore: fix type issues

* chore: update name of suppressed lint check

package.json

@@ -13,7 +13,8 @@
     "lint:fix": "fedx-scripts eslint --fix --ext .js --ext .jsx .",
     "snapshot": "fedx-scripts jest --updateSnapshot",
     "start": "fedx-scripts webpack-dev-server --progress",
-    "test": "fedx-scripts jest --coverage"
+    "test": "fedx-scripts jest --coverage",
+    "types": "tsc --noEmit"
   },
   "files": [
     "/dist"