Gradio theme cache

[w-e-w]

Description

Create a cache for Gradio theme so that it doesn't have to download it every time
and it allows the theme to be loaded when offline
this is implemented by using a decorator on gr.themes.ThemeClass.from_hub

the downside of this is that the theme will not be updated automatically when the author updates the theme
so I added an option to re-download if one want

cache is store under tmp/gradio_themes/<authro>_<theme>.json

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[w-e-w]

found the issue
I accidentally nuke one line of code when adding in one
and it just so happens that the issue doesn't trigger on my computer
"thank you test"

[w-e-w]

might be able to improve it some more

[AUTOMATIC1111]

Let's swap the option and rename it to Cache gradio themes locally.

[w-e-w]

[w-e-w]

damn capitalization

[w-e-w]

squashed

[w-e-w]