Add support for vim keybindings

[mohamedelhefni]

this PR is addressing the feature requested at #701

Changes

• Add Ace vim bindings js file
• Add the ability for user to switch between editor modes (Normal, Vim)
  • Store user last choice in localstorage

[mohamedelhefni]

Ping @sosedoff

[sosedoff]

Could you rebase/or update with master branch?

[mohamedelhefni]

I updated the branch with latest changes from master branch

[sosedoff]

IMO the cog button has no business being in the vicinity of "Execute"/"Explain" buttons area since its purely a configuration option and not something a user would change often (myself included). I propose you move the cog button to the top-right area of the query input box as its mosly blank space and we can make UX a bit more slim.

LMK if you have any questions or need to clarify anything.

[mohamedelhefni]

I moved the cog button to the top-right area as you proposed

[mohamedelhefni]

Ping @sosedoff