feat: create country field story

[jia1]

Problem

• Create country field story

Partially solves #481

Solution

• Rely on Dropdown to create a CountryField component in .stories

Breaking Changes

• Yes - this PR contains breaking changes
  • Details ...
• No - this PR is backwards compatible

Before & After Screenshots

AFTER:

[karrui]

lgtm

[karrui]

nit: keys should be SentenceCase, (values can remain as is)

e.g.

export enum Country {
  Afghanistan = 'AFGHANISTAN',
  ...
}

PS: Probably don't need to manually do it, can probably do it in a javascript/node playground haha, by

1. converting the enum into a object,
2. then running some sort of key-change function on the object, then
3. JSONify the object,
4. copy paste back into this enum

[jia1]

Addressed by the latest commit 5d1da632a04966ad5c89153086406a78bca4f807