feat: support `import Button from 'react-rainbow-components/Button'`

[LeandroTorresSicilia]

Support import Button from 'react-rainbow-components/Button'

Is your feature request related to a problem? Please describe. When importing components like this:

import { Button, Calendar } from 'react-rainbow-components';

you are importing the entire library which has a large bundle size, then if you instead import components like this:

import Button from 'react-rainbow-components/Button';
import Calendar from 'react-rainbow-components/Calendar';

you are only importing files related to Button and Calendar components thus decreasing the final bundle size of your app

[empas]

https://github.com/nexxtway/react-rainbow/issues/1339 almost the same