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/afe_audio_processor.h

@@ -9,6 +9,7 @@
 #include <string>
 #include <vector>
 #include <functional>
+#include <mutex>
 
 #include "audio_processor.h"
 #include "audio_codec.h"
@@ -37,6 +38,8 @@ private:
     AudioCodec* codec_ = nullptr;
     int frame_samples_ = 0;
     bool is_speaking_ = false;
+    std::vector<int16_t> input_buffer_;
+    std::mutex input_buffer_mutex_;
     std::vector<int16_t> output_buffer_;
 
     void AudioProcessorTask();