Add Keep Right integration as new layer for QA data fixing

[mvl22]

KeepRight [1] provides excellent analysis of common errors such as connectivity errors, floating islands, etc.

It would be useful to get this integrated as a tickbox-enabled layer, as per Mapillary. This would bring to the forefront these kinds of errors.

KeepRight recently added GeoJSON output, with the relevant server headers, so at a technical level this should be feasible:

Note that this ticket is not asking for automated spotting of user problems while editing - this is specifically about bringing visibility of already-spotted errors into a centralised location where editors are already going, i.e. iD, rather than assuming they will find these other locations on the web.

[bhousel]

Nice! Yeah we talk about Keepright occasionally on the iD issue list (I'm a big fan), but we don't have a specific ticket for it yet. I totally support the idea of QA overlay layers in the map data panel.

[bhousel]

Tagging @thomas-hervey - this would be a great issue to tackle once the OSM Notes feature #5107 is merged and stable 👍

[bhousel]

This happened! #5201