fix: Service consistency typing (#3309)

* Use more consistent type/structure for services

* Fix restoring SR so the tests described work

* One more typed service

* Added types for the Cornerstone library

* Couple more type fixes

extensions/cornerstone/package.json

@@ -7,6 +7,11 @@
   "repository": "OHIF/Viewers",
   "main": "dist/index.umd.js",
   "module": "src/index.tsx",
+  "types": "src/types/index.ts",
+  "exports": {
+    ".": "./src/index.tsx",
+    "./types": "./src/types/index.ts"
+  },
   "engines": {
     "node": ">=10",
     "npm": ">=6",