[openstreetmap/openstreetmap-website] Set bounding box size limits based on surface dimensions (Issue #4910)

[Christoph Hormann]

> One small thing is that I did consider using the diagonal size rather than width+length but my brief tests suggested it caused more variation as the shape of the box changed from square to elongated.

This goes a bit beyond this issue - but mathematically what you currently do (width+length) is the _L1 norm_.  The diagonal size would be the _L2 norm_.  At the other end of the scale (see https://en.wikipedia.org/wiki/Lp_space) you have the L<sup>inf</sup> norm, which would be `max(width, length)`.

I don't think which of these you choose ultimately matters since:

* you do this in a highly distorted equirectangular projection anyway.
* the bounding box is a highly suboptimal measure for spatial extent of the impact an edit has on the map, even if it was in a low distortion projection.

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