WebContent+LibWeb+LibJS: Report exceptions to the JS console

Print exceptions passed to `HTML::report_exception` in the JS console

Refactored `ExceptionReporter`: in order to report exception now
you need to pass the relevant realm in it. For passed `JS::Value`
we now create `JS::Error` object to print value as the error message.

Userland/Services/WebContent/WebContentConsoleClient.h

@@ -22,6 +22,7 @@ public:
 
     void handle_input(String const& js_source);
     void send_messages(i32 start_index);
+    void report_exception(JS::Error const&, bool) override;
 
 private:
     virtual void clear() override;