Kernel improvements (#485)

* **New Features**
  * Added public accessors for querying module/device start and ready state.

* **Refactor**
  * Internal state moved to opaque internal objects; module/device/driver initializers now explicitly initialize internal pointers.
  * Lifecycle handling updated to construct/destruct internal state and use accessors.

* **Tests**
  * Tests updated to use public accessors and explicit construct/destruct lifecycle calls.

* **Chores**
  * Test build/include paths and small metadata updated.

Platforms/PlatformEsp32/Source/drivers/esp32_i2c.cpp

@@ -25,7 +25,7 @@ struct InternalData {
 };
 
 #define GET_CONFIG(device) ((Esp32I2cConfig*)device->config)
-#define GET_DATA(device) ((InternalData*)device->internal.driver_data)
+#define GET_DATA(device) ((InternalData*)device_get_driver_data(device))
 
 #define lock(data) mutex_lock(&data->mutex);
 #define unlock(data) mutex_unlock(&data->mutex);
@@ -216,7 +216,7 @@ Driver esp32_i2c_driver = {
     .api = (void*)&esp32_i2c_api,
     .device_type = &I2C_CONTROLLER_TYPE,
     .owner = &platform_module,
-    .driver_private = nullptr
+    .internal = nullptr
 };
 
 } // extern "C"