validate crossing aeroways

[k-yle]

This PR enables validation warnings for crossing aeroways (runways and taxiways). These are the same validation rules as waterways/highways/railways.

For example,

• a runway that crosses another runway/taxiway needs to be connected.
• a taxiway that crosses a building on the same layer is now flagged as an issue.
• runways/taxiways that cross a highway must be connected.
  • In rare cases where major roads cross an aeroway, they are connected with the recently approved tag aeroway=aircraft_crossing

Closes #8342