Introduce hook that can be used to resolve style sheet object without producing class names

[michalkvasnicak]

For usages where people want to use style sheets from visage but want to pass them to their own css in js solution they should be able to use a hook for this that should be possible a part of core.

const style = useVisageStyles();

return <div css={style({ color: 'primary' })} />

The style object should be defined outside of component scope / in memo hook for performance optimization (caching).