Use OSC-8 URLs when rendering links in terminal

[effigies]

We currently render Markdown URLs as {text} ({URL}) (with coloring). Many terminals now support hyperlinks using OSC-8. It would be nice to detect hyperlink support and use OSC-8 hyperlinks.

• https://github.com/chalk/supports-hyperlinks
• https://github.com/sindresorhus/ansi-escapes

Follow-up to #211.

[yarikoptic]

I wonder if there is some usable generic markdown-to-ANSI/OSC-8 renderer so a single markup form could be used and automatically converted for the terminal... e.g. rust has https://crates.io/crates/mq-view

[effigies]

I had hoped to find something like that, but I haven't found one. I think @BitForge95's approach is pretty clean for now.

[BitForge95]

I'm adding this to the full Markdown renderer for #211. Since marked already tokenizes links, the OSC-8 wrapping will be straightforward to include in that PR.