fields/kerb: Make directionalCombo to allow optional left/right tagging

[tordans]

When the kerb is tagged on the highway=crossing node, it is assumed to have the same kerb left an right of the node. If that is not true, the tagging is kerb:left|right=*.

This PR changes the kerb fields for crossings to a directionalCombo in order to represent those left|right cases.

Current usage:

• crossing=* has 340 208 cases with kerb
• 2 690 with kerb:right
• 2 660 with kerb:left

https://taginfo.openstreetmap.org/keys/crossing#combinations

[github-actions]

🍱 You can preview the tagging presets of this pull request here.

[tordans]

Testing

Overpass turbo query: https://overpass-turbo.eu/?R&Q=[out:json][timeout:25];node["highway"]["kerb:left"]({{bbox}});out body;>;out skel qt;

node/9165437876

• https://pr-1206--ideditor-presets-preview.netlify.app/id/dist/#background=Bing&disable_features=boundaries&id=n9165437876&locale=en&map=20.00/52.47598/13.44462

[tordans]

Conclusion

Looking at the numbers some more I don't think this added complexity in the UI is worth it.
I will close this PR for that reason.