Support for visual sub-maneuvers

[ahmedre]

Within BannerInstructions, the MapBox API allows for a sub_content for describing sub-maneuvers. This data is used either for showing the step after the current one if it is to happen really quickly after the current step (ex turn left then turn right), or to specify lane information. This PR implements this within Ferrostar.

[ahmedre]

relevant urls:

• Directions API Playground
• Maneuver Instructions Documentation

I set this as a draft because I am not sure if this approach is correct, especially considering Valhalla responses (which I didn't think about too much), and about different types of subs, and about the overall model structuring. I figured it was easier to discuss over a PR than just text, so happy to make changes accordingly.

Also, I guess I am breaking backward compatibility, but am not sure about what the recommended way to fix this is.

[ianthetechie]

Looks like a few failures CI caught which are easy to fix (missing params etc.)

[ahmedre]

had to merge with main to do the fixes but should hopefully be good now

[ahmedre]

for the UI, happy to try this in another PR - we're still wrapping a ManeuverView from maplibre-navigation so would be a good opportunity for us to not depend on it anymore 👍