Network: Connect generated sidewalk to roads without sidewalk

When we pick the setting which considers roads without sidewalk as part of the routing network.
We can run into edge cases where the centerline (which we now consider a "footway") does not get connected to a generated sidewalk nearby.

https://a-b-street.github.io/speedwalk/#17.89/52.761535/13.24763

Is there something we could map, to make this easier? Adding crossings would not help, right?, given that the issue comes up after bulk actions where applied…