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.

Tactility/Source/kernel/SystemEvents.cpp

@@ -34,10 +34,6 @@ static const char* getEventName(SystemEvent event) {
             return TT_STRINGIFY(NetworkConnected);
         case NetworkDisconnected:
             return TT_STRINGIFY(NetworkDisconnected);
-        case LvglStarted:
-            return TT_STRINGIFY(LvglStarted);
-        case LvglStopped:
-            return TT_STRINGIFY(LvglStopped);
         case Time:
             return TT_STRINGIFY(Time);
     }