feat: add feature to download from url when p from register

[Uanela]

Depends on #3336

Summary

This PR simply takes #3336 one step further and allows downloading files directly to nvim when it finds URL on the register on p.

• There is no edge case that I've just forgotten what was is it and not quite sure if it is real a problem (may I'll update if I remember it)
• It only works when the text starts with http I don't if should support other protocols. btw passing an url that doens't start with http will be treated as a folder because my folder/file can be github.com/user/some-blog.png which is also a valid link on http context.

Context: #3336 (comment)

[gegoune]

I wasn't following recent discussions too closely, got one question: why do we want nvim-tree to handle fetching files over http?

[Uanela]

I wasn't following recent discussions too closely, got one question: why do we want nvim-tree to handle fetching files over http?

I read this through my phones notification bar and it sounded like whey do we need cars to fly, rsrsrsrs.

This PR as more to do with #3336 and is basically a one tiny addition to allow download files, WHY? On #3336 I added a feature to allow c and p between different nvim-tree instances this discussion was undergoing at #1549, as the feature simply copies the absolute path(s) and pastes into another instance and nvim-tree deals with it and make copy/cut an horizon of possibilites were opened:

1 - Copy/Cut files from anywhere on the OS as far as you got the absolute path, I can go to finder/explorer simply grab the absolute path and go paste into nvim-tree
2 - Most of the time when download something to a project (image, audio, video, etc) you download it to your OS explorer then copy to your IDE (and on vim we basically can't), then I thought why do I need to download first and copy to my project why not simply download directly to my project then this PR feature came along just grab the link and p on nvim-tree and it will download it.