[Module Proposal]: `avm/res/bot-service/bot-service`

### 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?

Resource Module

### Module Name

avm/res/bot-service/bot-service

### Module Details

[Bot Services](https://learn.microsoft.com/en-us/azure/bot-service/?view=azure-bot-service-4.0)
Customers is interested to know if we can have this service available as part of AVM.

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

Yes

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

AnkitSDesai

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

asishr

Start with the Azure Bot Services documentation linked in the proposal, then review the AVM module indexes and standards for resource modules. Done means the proposed avm/res/bot-service/bot-service module is implemented and available as part of AVM.

Written by the indexing model from the issue text.