Allow setting icons for scripts & commands

[YousufSSyed]

Icons can help distinguish each item when searching.

[johnlindquist]

In scripts, you can use:

// Image: /Users/johnlindquist/.kit/logos/egghead/eggo.svg

In choices:

await arg("", [
  {
    name: "egghead",
    img: "/Users/johnlindquist/.kit/logos/egghead/eggo.svg",
    value: "https://egghead.io",
  },
])

I'll look into bundling something like react-icons so we can add common icons by name, but for now, it needs to be a full path.