Integrate AI Agent Services and Chat Interface

- Added support for AI agent services, including `ConversationalAgentService`, to facilitate user interactions through a chat interface.
- Implemented `ChatTUI` for a terminal-based chat experience, allowing users to send messages and receive responses from the AI agent.
- Updated `EditorManager` to include options for displaying the agent chat widget and performance dashboard.
- Enhanced CMake configurations to include new source files for AI services and chat interface components.

This commit significantly expands the functionality of the z3ed system, paving the way for a more interactive and user-friendly experience in ROM hacking.

src/cli/handlers/agent/commands.h

@@ -28,6 +28,7 @@ absl::Status HandleDescribeCommand(const std::vector<std::string>& arg_vec);
 absl::Status HandleResourceListCommand(const std::vector<std::string>& arg_vec);
 absl::Status HandleDungeonListSpritesCommand(
     const std::vector<std::string>& arg_vec);
+absl::Status HandleChatCommand();
 
 }  // namespace agent
 }  // namespace cli