Adding Exotel Support to pipecat by adding a new serializer

[AmolDerickSoans]

Service Name

Exotel

Service Website

https://developer.exotel.com/api

Service Description

Adding Exotel as a cloud communication platform .

API Information

No response

Would you be willing to help implement this service?

• [x] Yes, I'd like to contribute
• [ ] No, I'm just suggesting