WebContent+WebDriver: Implement POST /session/{id}/window endpoint

Author: https://github.com/Tyrubias 🔰
Commit: 88ecc4a1e5
Pull-request: https://github.com/SerenityOS/serenity/pull/16060
Reviewed-by: https://github.com/TobyAsE
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibWeb/WebDriver/Client.cpp

@@ -63,6 +63,7 @@ static constexpr auto s_webdriver_endpoints = Array {
     ROUTE(GET, "/session/:session_id/title"sv, get_title),
     ROUTE(GET, "/session/:session_id/window"sv, get_window_handle),
     ROUTE(DELETE, "/session/:session_id/window"sv, close_window),
+    ROUTE(POST, "/session/:session_id/window"sv, switch_to_window),
     ROUTE(GET, "/session/:session_id/window/handles"sv, get_window_handles),
     ROUTE(GET, "/session/:session_id/window/rect"sv, get_window_rect),
     ROUTE(POST, "/session/:session_id/window/rect"sv, set_window_rect),