FR: expose some fzf actions to the user keymap #4

Is your feature request related to a problem? Please describe.
I want to be able to map jk for up/down outside of insert mode

Describe the solution you'd like
Fzf's navigation actions are exposed to the user config

Describe alternatives you've considered
Since the tool is meant to have vim style keybinds, it would be possible to hardcode stuff like hjkl this but I don't think it makes much sense.