Display highway shields

[bchapuis]

Description: We do not display highway shields yet in the basemap. It would be nice to have a solution that do not rely on colored sprites to display these shields, but I'm not sure how to do it. We probably need to investigate maplibre's documentation to do this and the solution should be discussed.

Tag: https://wiki.openstreetmap.org/wiki/Key:highway

Attachements:

Files: https://github.com/apache/incubator-baremaps/tree/main/basemap/layers/highway