feat: encode preview in parallel

[anubhavitis]

Enhanced Capture Mechanism:

Now, the capture process followed these steps:

• Creation of a Frame channel before the recorder initiated recording.
• A new thread is spawned to receive Frames from those channel and encode them.
• The primary thread is responsible for recording frames and saving them in the state for future GIF encoding.
• The secondary thread handles the encoding of frames received for preview.

[clearlysid]

closing in favour of #37