[Feat] Stroke a sprite/pattern for lines/polygon outlines

[vicb]

Target Use Case

I would like to use the MVTLayer to display airspaces on a map as on openaip.net:

It requires a sprite to be used when rendering lines/polygon.

The corresponding property in the MapBox style specification is line-pattern

Proposal

It can be implemented by adding a getLinePattern() property in the [stroke options)(https://deck.gl/docs/api-reference/layers/geojson-layer#stroke-options)

[vicb]

It looks like the Fill Style extension could be used for my use case if the sprite could be applied to the outline only (vs the full polygon)