Feat/xi labs voice 2

[AnniePacheco]

Summary

This PR includes the following fixes

• Retrieved the available eleven labs voices
• Set and validate the chosen voice for a persona

Changes

• Updated yaml apis/paios/openapi.yaml to include get voices
• Added VoicesFaces view and manager
• Updated PersonasManger
• Updated model Voice and schema Voice and include image_url, and sample_url
• Added the corresponding migration

Related Issues

N/A

Type of Change

New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING documentation.
• I have performed a self-review of my own code.
• I have added tests that prove my fix is effective or that my feature works.
• I have updated the documentation (if applicable).

Screenshots (if applicable) Example of use:

Additional Context

Tested locally using Swagger.