RouteOptions should expose toBuilder method

[LukasPaczos]

RouteOptions class could be reused to request a route and it should expose a toBuilder method so that it can be manipulated.

[Guardiola31337]

Maybe we can cut separate tickets but all options classes should expose a toBuilder method. So it'd be great if we could audit the code and add those toBuilder to any other class that might need it.

[LukasPaczos]

Integration in mapbox/mapbox-navigation-android#2416.