Add "sign allows cycling on sidewalk, both directions" option to cycleway quest/overlay

[wielandb]

Adds the option "None, but sign allows cycling on sidewalk, both directions" to the available road-side cycleway options.

Fixes #5888

[kmpoppe]

Using svgomg, the svg could get 48% smaller, (2.89k -> 1.39k) do you want to update the picture?

[westnordost]

Inkscape can do that too. Just save the SVG as "Optimized SVG". I always do that, I don't care for all that stuff Inkscape adds to the file to save the "session".

[wielandb]

I saved the svg as "Optimized SVG". For me, it reduced the size from 10kB to 8kB.

[wielandb]

I used svgomg on the already optimized svg and it reduced the file size a bit further. :)

[wielandb]

Implemented feature + tests. Tests work and used it myself a bit. Should be ready for review now.

[westnordost]

Thank you, looks good!

[FloEdelmann]

@wielandb There is a failed test now:

de.westnordost.streetcomplete.osm.cycleway.CyclewayCreatorKtTest > apply allowed on sidewalk with both directions to both sides FAILED

https://github.com/streetcomplete/StreetComplete/actions/runs/11347572803/job/31559284851