Support for booking the slot

[katta]

Introduce book a slot command in jabfinder, it requires the user to enter OTP along with session and slot details. But the CoWIN public API allows us to do this.

Use these references for the API spec and examples

APISpec: https://apisetu.gov.in/public/api/cowin#/
Examples: https://documenter.getpostman.com/view/9564387/TzRPip7u#75eef4e7-a6ee-48a0-b8aa-b20abff7081b