Vim keybindings in query and python cells

[dperetin]

I spend a lot of time in querybook, writing what's effectively code. Having access to basic vim navigation and editing features would speed up my workflow a lot.

Proposal

• Use codemirror-vim to add vim keybindings to query and python cells.
• Have the feature configurable in Setting, under Editor. Default setting should be disabled, so nothing changes for most users.
• If a users enables it, they see vim mode status at the bottom of the cell and can use keybindings provided by codemirror-vim.

Example when in insert mode:

example when in normal mode, recording a macro:

Settings page