feat(core): support for `@keyframes`
feat(core): support for `@keyframes`

example:

```ts
const styles = ({
  item: {
    animation: '{pulse} 5s infinite'
  },
  $keyframes: {
    pulse: {
      0: {
        backgroundColor: '#000'
      },
      100: {
        backgroundColor: 'red'
      }
    }
  }
});
```

A-l-y-l-e/Alyle-UI,A-l-y-l-e/Alyle-UI,A-l-y-l-e/Alyle-UI,A-l-y-l-e/Alyle-UI