LLM diarization function

[GeorgeEfstathiadis]

• Function to process diarized transcribed JSON file, for correcting speaker diarization errors
• Comprised of pre-processing, SageMaker Endpoint call and post-processing of a transcription file

Methods doc: https://docs.google.com/document/d/16qdh3CYEGM2EcYlKXSCNk5T2gPeD_sSk-rXD54HN01w/edit#heading=h.ms9pl2pmmwrz