Update Worklet IDL to latest version from gecko (#1817)

Author: msiglreith

crates/web-sys/webidls/enabled/Worklet.webidl

@@ -7,8 +7,13 @@
  * https://drafts.css-houdini.org/worklets/#idl-index
  */
 
-[Pref="dom.worklet.enabled"]
+[Pref="dom.worklet.enabled",
+ Exposed=Window]
 interface Worklet {
   [NewObject, Throws, NeedsCallerType]
-  Promise<void> import(USVString moduleURL);
+  Promise<void> addModule(USVString moduleURL, optional WorkletOptions options = {});
+};
+
+dictionary WorkletOptions {
+  RequestCredentials credentials = "same-origin";
 };