Add option to use cache when download pretrained files

[philss]

This makes the usage simpler and faster.

[jonatanklosko]

We could also make a HEAD request and compare E-tag, since for revision like main the file may change, that's what we do in the other project. But the reference implementation doesn't do it either, so it's probably fine, we can revisit if we run into any actual issues!

[jonatanklosko]

Oh actually, having a brief look at the cached_path rust package, comparing E-tag seems to be exactly what it does?

[philss]

@jonatanklosko humm, interesting! I think I'm going to move this responsibility to the HTTP client then 🤔
I'm going to try there.

[philss]

I think I'm going to move this responsibility to the HTTP client then

Actually maybe not. Haha. I will be out for the next two hours, but I change this after I'm back.

[philss]

@jonatanklosko it's not pretty but now works with E-tags :)

[jonatanklosko]

Minor comments, but looks good to me!

[jonatanklosko]

🚢 🐈