feat: add ability to disable kbar

[timc1]

Ref #323.

Dynamically enable/disable kbar; useful for controlling when command k should exist within your site:

import { useKbar } from "kbar";

function MyApp() {
  const { query, disabled } = useKbar(state => ({
    disabled: state.disabled
  }));

  return <button onClick={() => query.disable(!disabled)}>{disabled ? "Disabled" : "Disable"}</button>
}

[vercel]

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Name	Status	Preview	Updated (UTC)
kbar	✅ Ready (Inspect)	Visit Preview	Jul 17, 2023 2:33pm