Add Agent-to-Agent CopilotStudio Client Sample

[shaminookapoor]

Summary

This PR adds a new CopilotStudio client sample that demonstrates agent-to-agent communication capabilities. The sample shows how to connect to and communicate with multiple agents hosted in Microsoft Copilot Studio across different environments.

Changes

• Added DualCopilotChatService for managing communication between two Copilot Studio agents
• Reorganized CopilotStudio client files into samples/basic/copilotatudio-agentToagent/dotnet/ directory structure
• Added comprehensive README with setup instructions and architecture overview
• Added support for interactive chat with relay functionality between agents

Features

• Interactive console interface for chatting with multiple agents
• Relay functionality to send messages from one agent to another
• Support for both interactive and service-to-service authentication
• Proper error handling and logging

Testing

• Tested with two different Copilot Studio agents
• Verified authentication flows work correctly
• Confirmed relay functionality works as expected

Related Issues

Addresses the need for agent-to-agent communication samples in the Microsoft Agents ecosystem.

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[MattB-msft]

@shaminookapoor Thanks for you proposed sample here... However, this is a slight variation on the existing sample, is there a particular reason you feel this needs a standalone sample?

[JimDaly]

#242 is reorganizing the sample structure. This PR will not fit in the new organization.