RouteAlternativesOptions  
    The options available for observing alternative routes. The RouteOptions used to set the current active route are updated according to the current route progress.
Register your RouteAlternativesObserver through MapboxNavigation, the onRouteAlternatives callback will be triggered every intervalMillis. There are multiple conditions that will disable alternative route requests:
- There are no observers registered 
- There is not an active route 
- The trip session is not started 
Parameters
intervalMillis 
The interval in milliseconds, default is 5 min. Minimum is 30 seconds.
avoidManeuverSeconds  
a radius in seconds around origin point where need to avoid any significant maneuvers. Unit is seconds, default is 8 second.
Types
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                Build your RouteAlternativesOptions.