Add configuration for AI agent - Rider (Copilot)

[IvanMurzak]

https://www.jetbrains.com/rider/download
https://plugins.jetbrains.com/plugin/17718-github-copilot--your-ai-pair-programmer

Tasks

• Find, crop and rescale (64 x 64 pixels) and save transparent image for the AI agent in the location: Unity-MCP-Plugin/Assets/root/Editor/Gizmos/ai-agents
• Create configurator class in the location: Unity-MCP-Plugin/Assets/root/Editor/Scripts/UI/AiAgentConfigurators/Impl
• Add configurator class in the registry class AiAgentConfiguratorRegistry