feature request: add new GitHub Monaspace font to font-selection

[trm217]

GitHubNext recently released a mono-space font called Monaspace.
The font comes in 4 unique variations. Additionally it has a set of ligatures that can be used.
Even though the font can easily be added by hand to carbon, I think it might be worth considering adding this font, as I would expect that we will start seeing this code all over the place very soon. In addition, it's pretty fancy. 💅🏻
Based on all the things mentioned above, I think it'd be worth considering adding this font to the carbon font-selection.