* Add a 'commandline' command for manipulating the current buffer
from `executehostcommand` keybindings. Inspired by fish:
https://fishshell.com/docs/current/cmds/commandline.html
* Update to development reedline
Includes nushell/reedline#472
Co-authored-by: sholderbach <sholderbach@users.noreply.github.com>