[Module Proposal]: `avm/ptn/sa/customer-chatbot`

### Check for previous/existing GitHub issues/module proposals

- [x] I have checked for previous/existing GitHub issues/module proposals.

### Check this module doesn't already exist in the module indexes

- [x] I have checked for that this module doesn't already exist in the module indexes.

### Bicep or Terraform?

Bicep

### Module Classification?

Pattern Module

### Module Name

avm/ptn/sa/customer-chatbot

### Module Details

This pattern modules deploys the infrastructure for GSA Customer chat bot Solution Accelerator, available at the following GitHub repository: https://github.com/microsoft/customer-chatbot-solution-accelerator/tree/main

### Do you want to be the owner of this module?

No

### Module Owner's GitHub Username (handle)

aniaroramsft

### (Optional) Secondary Module Owner's GitHub Username (handle)

alguadam