Update eleven labs integration to consume the voice generation api

Update Hume integration to use OCTAVE TTS endpoint, update Elevenlabs integration to use voice design endpoint, no longer specify voice since voices are now generated

Add formatter (black) and format all code in src directory— using black default formatting configuration

Improve ElevenLabs integration documentation

Restore encapsulation for ElevenLabs integration, update TTS functions to return the voice name in addition to the audio

Update UI to compare Hume vs Elevenlabs 50% of the time, and Hume vs Hume 50% of the time

Update documentation and fix typos across project

Clean up doc strings

Clean up docstrings across files

Improve Hume API error handling

Improve ElevenLabs API error handling

Clean up documentation, remove orphaned utility, create constants file to store constants

Update Hume integration to randmonly pick a voice from a predefined list of top voices

Clean up ElevenLabsConfig

Update ElevenLabs integration to randmonly pick a voice from a predefined list of top voices

Remove excessive logging from debugging

Add validation for presence of output_format attribute in ElevenLabsConfig

Adds ElevenLabs integration

Organize project structure