Move to TypeScript (#3830)

This moves our JS file to use TS instead, which allows us to use a proper linter to check the code.
All related files where moved out from the root in a dedicated folder to avoid polluting the Rust environment.

.github/dependabot.yaml

@@ -0,0 +1,11 @@
+version: 2
+
+updates:
+  - package-ecosystem: npm
+    directory: src/platform_impl/web/script
+    schedule:
+        interval: daily
+    groups:
+        github-actions:
+            patterns:
+                - '*'