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.

Devices/btt-panda-touch/Source/devices/Display.cpp

@@ -4,7 +4,7 @@
 #include <PwmBacklight.h>
 #include <RgbDisplay.h>
 
-std::shared_ptr<tt::hal::touch::TouchDevice> _Nullable createTouch() {
+std::shared_ptr<tt::hal::touch::TouchDevice> createTouch() {
     // Note for future changes: Reset pin is 41 and interrupt pin is 40
     auto configuration = std::make_unique<Gt911Touch::Configuration>(
         I2C_NUM_0,