feat: initial support for conversational agents

[GabrielVasilescu04]

Description

Initial PR for conversational agents support. Implemented sdk method to get the latest message from a conversation

[Copilot]

Pull Request Overview

This PR introduces initial support for conversational agents by implementing SDK methods to retrieve the latest message from a conversation. The implementation includes models for conversations and exchanges, along with a service layer to interact with the conversation API.

Key Changes:

• Added generic paginated response model (GetResponse) for handling API responses
• Implemented ConversationsService with methods to retrieve conversations by job key and fetch the latest message
• Extended conversation models with UiPathConversationModel for job key to conversation ID mapping

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/uipath/agent/conversation/api_responses.py	New generic paginated response model for GET requests
src/uipath/agent/conversation/conversation.py	Added conversation model and response type for mapping job keys to conversation IDs
src/uipath/agent/conversation/exchange.py	Added exchange response type for paginated exchange queries
src/uipath/agent/conversation/citation.py	Added optional number field to citation source model
src/uipath/agent/conversation/__init__.py	Exported new response types for public API
src/uipath/_services/conversations_service.py	New service implementing conversation and message retrieval logic
src/uipath/_services/__init__.py	Exported new conversations service
src/uipath/_uipath.py	Added conversational property to expose the service

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