Refactor LVGL code into kernel module (#472)

* **New Features**
  * Added a standalone LVGL module and enabled LVGL support in the simulator for richer local UI testing.

* **Refactor**
  * HAL and LVGL split into distinct modules; startup and device attach/detach flows reorganized for clearer lifecycle management.
  * Public APIs tightened with clearer nullability/documentation.

* **Bug Fixes**
  * More consistent LVGL start/stop and device attach/detach behavior for improved stability.

Drivers/CST816S/Source/Cst816Touch.h

@@ -49,7 +49,7 @@ private:
     std::unique_ptr<Configuration> configuration;
     esp_lcd_panel_io_handle_t ioHandle = nullptr;
     esp_lcd_touch_handle_t touchHandle = nullptr;
-    lv_indev_t* _Nullable deviceHandle = nullptr;
+    lv_indev_t* deviceHandle = nullptr;
 
     void cleanup();