Add a Link type for printing OSC 8 hyperlinks

[ChrisJr404]

Closes #132.

console already recognizes OSC 8 hyperlinks when stripping/measuring text, but there was no way to emit one. This adds a small Link wrapper, in the same spirit as Emoji, that prints text as an OSC 8 hyperlink on terminals that support it.

Like styling, the escape is only written when colors are enabled for the target stream, so piped or redirected output just shows the plain text. You can force it on or off with .force(..) and target stderr with .for_stderr().

use console::Link;
println!("Read the {}.", Link::new("docs", "https://docs.rs/console"));

I went with Link::new(text, url) so it reads a bit like a Markdown link, but I'm happy to flip the order if you'd rather have the url first. epage linked anstyle-hyperlink on the issue as a reference; I kept this minimal for now and left out the optional id= parameter.