Add traffic congestion segments to the main Route

[engali94]

This approach involves:

1. Adding a property or method to the main Route struct to retrieve congestion segments.
2. Each adapter would be responsible for extracting and mapping its specific congestion data to a common format when converting from the adapter-specific route to the main Route.

Pros:

• Keeps the congestion data close to the route data it belongs to.
• Provides a unified interface for accessing congestion data across different adapters.

Cons:

• Slightly increases the complexity of the core Route struct.

Proposed slution:

In ./ferrostar/src/models.rs

pub struct CongestionSegment {
    pub level: String,
    pub geometry: Vec<GeographicCoordinate>,
}

pub struct Route {
    // ... 
    congestion_segments: Option<Vec<CongestionSegment>>,
}

In ./ferrostar/src/routing_adapters/osrm/mod.rs

impl Route {
    pub fn from_osrm(
        route: &OsrmRoute,
        waypoints: &[OsrmWaypoint],
        polyline_precision: u32,
    ) -> Result<Self, ParsingError> {
        // ...

        let congestion_segments = extract_congestion_segments(route)?;

        Ok(Route {
            // ...
            congestion_segments: Some(congestion_segments),
        })
    }
}

fn extract_congestion_segments(route: &OsrmRoute) -> Result<Vec<CongestionSegment>, ParsingError> {
    // adapter-specific logic to extract and convert congestion data
}

[engali94]

Closing in favor of #287