Nebula AI .NET Integration (Beta)

[0xFirekeeper]

Closes TOOL-3098

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PR-Codex overview

This PR introduces new classes and methods for handling feedback, chat interactions, and session management within the Thirdweb.AI namespace. It enhances the Thirdweb SDK functionality by enabling users to submit feedback, send messages, and manage sessions via an API.

Detailed summary

• Added FeedbackClient for submitting feedback with SubmitFeedbackAsync method.
• Introduced ChatClient for sending single/multiple messages via SendMessageAsync and SendMessagesAsync.
• Created ExecutionClient for executing commands with ExecuteAsync and ExecuteBatchAsync.
• Implemented SessionManager for managing sessions: list, get, create, update, delete, and clear sessions.
• Developed ThirdwebNebula class to encapsulate session, chat, execution, and feedback functionalities.
• Added data models for API interactions: Feedback, FeedbackParams, ChatResponse, Session, CreateSessionParams, etc.
• Updated Constants to include NEBULA_API_URL and NEBULA_DEFAULT_MODEL.

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[linear]

TOOL-3098 Simple & User Friendly Chat/Execute