Refactor of ChatGPT thread, connect to C2S packet handling, and initial ChatDataManager class, to keep track of each entity and previous messages.

Added initial C2S packet and click handler. Refactor of json messages. Clean-up of imports and removed a few log statements. Removed old experimental code.

Initial proof of concept changes to Fabric Minecraft example mod. Generate 1 random ChatGPT prompt, display it above all Living Entities.