feat: improve background streaming handler with microphone management

- Enhanced BackgroundStreamingHandler to manage microphone streams effectively during background execution.
- Introduced VoiceBackgroundAudioManager for better audio session handling, ensuring proper activation and deactivation based on microphone usage.
- Updated startBackgroundExecution method to handle microphone requirements dynamically, improving resource management.
- Ensured microphone streams are cleared appropriately when stopping background execution, enhancing overall stability.

android/app/src/main/kotlin/app/cogwheel/conduit/BackgroundStreamingHandler.kt

@@ -266,7 +266,9 @@ class BackgroundStreamingHandler(private val activity: MainActivity) : MethodCal
     }
 
     private fun startBackgroundExecution(streamIds: List<String>, requiresMic: Boolean) {
+        activeStreams.clear()
         activeStreams.addAll(streamIds)
+        streamsRequiringMic.retainAll(activeStreams)
         if (requiresMic) {
             streamsRequiringMic.addAll(streamIds)
         }