D2-PromptSelector-comfyUI

This is a version of [a/sd-d2-prompt-selector](https://github.com/da2el-ai/sd-d2-prompt-selector) reworked for ComfyUI. It's just a prototype that I've put together for now. The random syntax of sd-d2-prompt-selector cannot be used; instead, the DynamicPrompt syntax is used