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.

Platforms/PlatformEsp32/Source/drivers/esp32_gpio.cpp

@@ -118,10 +118,10 @@ extern struct Module platform_module;
 Driver esp32_gpio_driver = {
     .name = "esp32_gpio",
     .compatible = (const char*[]) { "espressif,esp32-gpio", nullptr },
-    .startDevice = start,
-    .stopDevice = stop,
+    .start_device = start,
+    .stop_device = stop,
     .api =  (void*)&esp32_gpio_api,
-    .deviceType = &GPIO_CONTROLLER_TYPE,
+    .device_type = &GPIO_CONTROLLER_TYPE,
     .owner = &platform_module,
     .driver_private = nullptr
 };

Platforms/PlatformEsp32/Source/drivers/esp32_i2c.cpp

@@ -211,10 +211,10 @@ extern struct Module platform_module;
 Driver esp32_i2c_driver = {
     .name = "esp32_i2c",
     .compatible = (const char*[]) { "espressif,esp32-i2c", nullptr },
-    .startDevice = start,
-    .stopDevice = stop,
+    .start_device = start,
+    .stop_device = stop,
     .api = (void*)&esp32_i2c_api,
-    .deviceType = &I2C_CONTROLLER_TYPE,
+    .device_type = &I2C_CONTROLLER_TYPE,
     .owner = &platform_module,
     .driver_private = nullptr
 };