WIP: feat: integrate ElevenLabs for Twilio call handling

[Utkarshbhimte]

Relates to:

Risks

Low

Background

What does this PR do?

Adds integration with twillio for an agent to receive calls via twillio

What kind of change is this?

Features: adding routes to client-direct package

Documentation changes needed?

My changes require a change to the project documentation. I will do that shortly

Testing

Where should a reviewer start?

packages/client-direct/src/index.ts

Detailed testing steps