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.

Devices/m5stack-cores3/Source/module.cpp

@@ -17,7 +17,8 @@ struct Module device_module = {
     .name = "m5stack-cores3",
     .start = start,
     .stop = stop,
-    .symbols = nullptr
+    .symbols = nullptr,
+    .internal = nullptr
 };
 
 }

Devices/m5stack-cores3/m5stack,cores3.dts

@@ -55,8 +55,8 @@
 		scl-pullup;
 	};
 
-	// TODO: Enable speaker via I2C: https://github.com/m5stack/M5Unified/blob/a6256725481f1bc366655fa48cf03b6095e30ad1/src/M5Unified.cpp#L417
-	// TODO: Enable microphone via I2C: https://github.com/m5stack/M5Unified/blob/a6256725481f1bc366655fa48cf03b6095e30ad1/src/M5Unified.cpp#L616
+	// TODO: Enable speaker via ES7210 I2C: https://github.com/m5stack/M5Unified/blob/a6256725481f1bc366655fa48cf03b6095e30ad1/src/M5Unified.cpp#L417
+	// TODO: Enable microphone via ES7210 I2C: https://github.com/m5stack/M5Unified/blob/a6256725481f1bc366655fa48cf03b6095e30ad1/src/M5Unified.cpp#L616
 	i2s0 {
 		// Note: M5Unified sets the following for speaker: magnification = 2, oversampling = 1
 		// Note: M5Unified sets the following for microphone: magnification = 4