Enhance audio processing and wake word detection (#1739)

* Enhance audio processing and wake word detection

- Set task priority in Application::Run to improve responsiveness.
- Log detected wake words with their state in HandleWakeWordDetectedEvent.
- Streamline audio feeding in AudioService to handle both wake word and audio processor events.
- Implement input buffering in AfeAudioProcessor, AfeWakeWord, CustomWakeWord, and EspWakeWord to manage audio data more efficiently.
- Clear input buffers on stop to prevent residual data issues.

* Refactor audio processing to enhance thread safety and state management

- Implement early return checks in Feed methods of AfeAudioProcessor, AfeWakeWord, CustomWakeWord, and EspWakeWord to prevent processing when not running.
- Introduce std::atomic for running state in CustomWakeWord and EspWakeWord to ensure thread-safe access.
- Consolidate input buffer management with mutex locks to avoid race conditions during Stop and Feed operations.

* Refactor listening mode handling and wake word detection configuration

- Replace direct mode setting logic with a new GetDefaultListeningMode method for improved clarity and maintainability.
- Update HandleToggleChatEvent, HandleWakeWordDetectedEvent, and ContinueWakeWordInvoke to utilize the new method for determining listening mode.
- Introduce Kconfig option WAKE_WORD_DETECTION_IN_LISTENING to enable or disable wake word detection during listening mode, enhancing configurability.

main/audio/processors/no_audio_processor.h

@@ -3,6 +3,7 @@
 
 #include <vector>
 #include <functional>
+#include <atomic>
 
 #include "audio_processor.h"
 #include "audio_codec.h"
@@ -27,7 +28,7 @@ private:
     int frame_samples_ = 0;
     std::function<void(std::vector<int16_t>&& data)> output_callback_;
     std::function<void(bool speaking)> vad_state_change_callback_;
-    bool is_running_ = false;
+    std::atomic<bool> is_running_ = false;
 };
 
 #endif