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/Kconfig.projbuild

@@ -680,6 +680,16 @@ config SEND_WAKE_WORD_DATA
     help
         Send wake word data to the server as the first message of the conversation and wait for response
 
+config WAKE_WORD_DETECTION_IN_LISTENING
+    bool "Enable Wake Word Detection in Listening Mode"
+    default n
+    depends on USE_AFE_WAKE_WORD || USE_CUSTOM_WAKE_WORD
+    help
+        Enable wake word detection while in listening mode.
+        When enabled, the device can detect wake word during listening,
+        which allows interrupting the current conversation.
+        When disabled (default), wake word detection is turned off during listening.
+
 config USE_AUDIO_PROCESSOR
     bool "Enable Audio Noise Reduction"
     default y