ENH: Allow `mpl_configdir/stylelib` to point to URLs

[CJ-Wright]

Would it be possible for the files in mpl_configdir/stylelib to point to URLs?
Eg. style.use('presentation') points to the mpl_configdir/stylelib/presentation.mplstyle which points to a URL based stylesheet
This could be very helpful for my group as we are trying to share a couple of style sheets on the internet.

[QuLogic]

You can do style.use('http://example.com/stylelib/presentation.mplstyle') already.

[CJ-Wright]

I understand that, however I think most of my potential users would prefer to just write presentation similar to how it would be if the stylesheet was in the local config folder.

[tacaswell]

This already basically works

presentation_style = 'http://url'
style.use(presentation_style)

@danielballan did this in grad schoool. See http://matplotlib.org/api/style_api.html#matplotlib.style.use

I do not see a way to implement this that is not more complicated than it is worth.

[github-actions]

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