LibJS: Add the FinalizationRegistry built-in object

As well as the needed functionality in VM to enqueue and run cleanup
jobs for the FinalizationRegistry instances.

Userland/Libraries/LibJS/Interpreter.cpp

@@ -64,6 +64,8 @@ void Interpreter::run(GlobalObject& global_object, const Program& program)
     // in which case this is a no-op.
     vm.run_queued_promise_jobs();
 
+    vm.run_queued_finalization_registry_cleanup_jobs();
+
     vm.finish_execution_generation();
 }