LibWeb+WebContent+WebDriver: Add WebDriver endpoint to open new window

Author: https://github.com/kalenikaliaksandr
Commit: f287165823
Pull-request: https://github.com/SerenityOS/serenity/pull/17855
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Services/WebContent/WebDriverClient.ipc

@@ -16,6 +16,7 @@ endpoint WebDriverClient {
     refresh() => (Web::WebDriver::Response response)
     get_title() => (Web::WebDriver::Response response)
     close_window() => (Web::WebDriver::Response response)
+    new_window(JsonValue payload) => (Web::WebDriver::Response response)
     get_window_rect() => (Web::WebDriver::Response response)
     set_window_rect(JsonValue payload) => (Web::WebDriver::Response response)
     maximize_window() => (Web::WebDriver::Response response)