Expose exits on RouteSteps

[ahmedre]

No description provided.

[ahmedre]

I was checking and exits can be in 2 places - one is here (which already exists), and the second is inside of the various BannerInstruction.BannerContent (for primary, secondary, and sub). For the second place, I can open another PR - should we expose BannerContents instead?

In a previous patch, we mapped various fields / types within the BannerContent into lanes, so wondering if this is the approach we should continue (i.e. add fields denoting the exit-numbers fields in addition to lanes, etc), or if we want to keep lanes and also add the actual info, or if we want to remove lanes altogether in favor of just exposing what is now parsed as Vec<BannerContentComponent>?

i.e. option 1:

pub struct VisualInstructionContent {
    pub text: String,
    pub maneuver_type: Option<ManeuverType>,
    pub maneuver_modifier: Option<ManeuverModifier>,
    pub roundabout_exit_degrees: Option<u16>,
    pub lane_info: Option<Vec<LaneInfo>>,
    pub exit_numbers: Option<Vec<String>>,
}

or option 2:

pub struct VisualInstructionContent {
    pub text: String,
    pub maneuver_type: Option<ManeuverType>,
    pub maneuver_modifier: Option<ManeuverModifier>,
    pub roundabout_exit_degrees: Option<u16>,
    pub lane_info: Option<Vec<LaneInfo>>,
    pub details: Option<Vec<BannerContentComponent>>,
}

or option 3 being option 2 with removing lane_info.