[Feature request]: wheelchair accessible routes

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Use case

We are using the navigation SDK to do walking route navigation. The routes API supports passing wheelchair accessible routes, but I don't see any option in the navigation SDK for this. Is this something that can be done or a feature that needs to be added to the SDK?

### Proposal

The route options should take the accessibility option.

const routingOptions = {
travelMode: TravelMode.WALKING,
avoidFerries: true,
language: language
};