Provide a textbox to insert and use any Stable Diffusion Model

[redromnon]

Problem

Currently, there's a dropdown widget implemented that allows users to choose a Stable Diffusion model from a set of limited options. There are cases where users want to use a specific model outside the list.

Solution

Provide a simple textbox that allows the user to enter the name of any Text2Image Stable Diffusion model from Huggingface. Also, it would be cool if the search textbox and the dropdown widget could be merged.