Implement WindowOrWorkerGlobalScope::reportError (#40654)

This web API is alternative API to `throw e`, which is why we can reuse
a lot of the existing machinery.

The one testcase that isn't passing yet is because it reports an empty
`TypeError`. The current logic in `ErrorInfo` only retrieves the message
data, but doesn't include the type of the exception. For that, we need
to use `(*report)._base.errorNumber` and map that back to the original
type codes. However, deferring that to a follow-up as that requires some
more work in mozjs.

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

components/script_bindings/webidls/WindowOrWorkerGlobalScope.webidl

@@ -10,6 +10,8 @@ typedef (TrustedScript or DOMString or Function) TimerHandler;
 interface mixin WindowOrWorkerGlobalScope {
   [Replaceable] readonly attribute USVString origin;
 
+  undefined reportError(any e);
+
   // base64 utility methods
   [Throws] DOMString btoa(DOMString data);
   [Throws] DOMString atob(DOMString data);