Provide a keymap for the anki-editor-mode

[Gleek]

Right now the only ways to bind keys for anki-editor commands is to define them either globally or in the org-mode-map.

This results is me creating harder to type keys to do common actions inside anki-editor-mode, so that the keys don't conflict with other minor modes in org.

Providing a default minor mode keymap should help here.

[Joh11]

I actually had the same issue today, and solved it by using a custom keymap (see my reddit post). But indeed it could be better if a real keymap was provided