chore: add typescript

It seems that some package is complaining about typescript not being
available as it's listed as a peer dependency. Hoping this will solve
that, even though I'd prefer not to have it as a direct dependency.

Author: scriptcoded

package-lock.json

@@ -38,6 +38,7 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^6.1.1",
     "eslint-plugin-standard": "^4.1.0",
-    "jest": "^29.3.1"
+    "jest": "^29.3.1",
+    "typescript": "4.9.4"
   }
 }