Support combination of media and pseudo

[finkef]

Hey, awesome library! 🙌
It would be great if this project could support applying pseudos within media queries, for example:

const { styles, ids } = StyleSheet.create({
    example: {
        '@media (min-width: 300px)': {
            ':hover': {
                backgroundColor: 'red',
            }
        }
    }
})

From what I understand, this would require some changes in createCssRule like recursively calling it for nested media or pseudo queries, but I'm not sure of all the implications this might have.