[TODO] Implement audio capture

[0Ky]

• Capture audio data from a selectable option of sources (e.g., system audio, microphone, or both) using WASAPI (Windows Audio Session API).
• Encode audio using the AAC codec.
• Take the encoded video and audio streams and multiplex them into a single .mp4 container.
• Ensure that audio and video are synchronized by testing the capture using an AV sync test video
• UI/UX Considerations, provide appropriate UI controls:
  • Allow users to select audio sources (system audio, microphone, or both).
  • Provide feedback mechanisms, like audio meters, to show real-time audio levels.
  • Give users the option to toggle mute the audio source.

Note: We currently use video-rs a high-level abstraction of ffmpeg-next to encode video, unfortunately there is no audio API implemented, you may need to leverage ffmpeg-next for audio encoding/muxing. You may want to utilize entirely on another crate to encode/mux both video/audio sources, which will require rewriting the existing encode_frames function.