[SIP-5] Remove references to slice from all deck.gl components. (#6039)

* start removing slice.

* migrate arc

* refactor arc

* refactor path

* refactor deck polygon

* remove commented code

* refactor factory function

* refactor grid

* refactor hex

* refactor polygon

* refactor scatter

* refactor geojson

* refactor screengrid

* remove unnecessary nesting

* add proptypes

* add proptypes

* refactor deck.gl Multi

* fix lint

* Use export syntax instead of module.exports