feature request: shortcut for highlight

[xygn]

Anki 2.1.45 introduces highlight text in the toolbar of the editor.

However there's no shortcut for it, it would be great if it can be implemented as a potential shortcut

https://github.com/ankitects/anki/blob/6a9b4cd0f16ade97b801726f213c58ddee33b19b/ftl/core/editing.ftl#L36