[User Story] - Provide Support for Teams Integration

[dantelmomsft]

Description
Provide option for for teams as conversational chat channel

Acceptance Criteria

• teams chat can be configured as conversational agents channel (MUST-HAVE)
• attachments (invoice images) are still supported (MUST-HAVE)
• tool approval UI streaming is supported (MUST-HAVE)
• agents progress notification (NICE-TO-HAVE)

Design Considerations

• Use Microsoft Agents SDK

Main Affected Modules and/or Classes

• we have different frontend options here: https://github.com/Azure-Samples/agent-openai-python-banking-assistant/tree/main/app/frontend. that's where we can put the teams folder which contains manifest etc.
• on the backend side we have a different main/routers for different chat protocol supported https://github.com/Azure-Samples/agent-openai-python-banking-assistant/tree/main/app/backend/app/routers.
• the handoff attached to the simple webchat chat_routers_handoff.py
• the handoff attached to chatkit protocol is chatkit/chat_routers.py

we might think to add a folder called activity that has the code to manage the activity protocol (supported by Microsoft Agents SDK) and leverage the MAF handoff orchestration logic