Support `animation-name`

[mizdra]

postcss-modules supports exporting animation-name. So CSS Modules Kit should also support it.

Related Issues

• Missing type definitions for @keyframes #191

[mizdra]

However, extracting animation-name is extremely difficult. 😇

https://github.com/css-modules/postcss-modules-local-by-default/blob/106cedd9a4b564fba5e69da4f7fd2ff4f9f0d58f/test/index.test.js#L162-L399

It takes a lot of time to support this.