:r https://google.com works in nvim, doesn't work in emacs

`:r(ead)` and `:e(dit)` commands in vim can take urls and through netrw (built-in) plugin insert/edit the content of it.

Unfortunately, this doesn't seem to work in Emacs, so you can't do things like:

`:e scp://user@host/path-to-file` or `:r https://some-web-address`

Minor thing for sure, yet maybe it would be nice to have the parity.

Additionally, I think it would be great if it was possible to execute arbitrary elisp functions through `:r` and `:e`, something that I don't think can be done in neovim, but maybe can be achieved in emacs relatively easily?

Start by locating the implementations of the :r(ead) and :e(dit) commands and determine how they handle file arguments. Compare their behavior with the described Vim cases for https:// URLs and scp:// paths, then decide whether arbitrary Emacs Lisp invocation belongs in the same scope. Done means the requested remote or URL editing behavior is defined and covered by appropriate tests.

Written by the indexing model from the issue text.