[openstreetmap/openstreetmap-website] add optional coordinate epoch to nodes (#3203)

[mmd]

> It's not really changing the whole world, the epoch attribute would be optional and opt in, it's only set when either using a more accurate GPS or some compatible imagery layers, most of the uploaded nodes wouldn't use an epoch just yet.

There's really no way to add an additional attribute without bumping the API version to 0.7 along the way. You would have to change pretty much every single component along the process, including but not limited to the OSM website, CGImap, planet generation, osmdbt for minutely diff generation, and last and not least, every single editing application. Otherwise, there's no way to even fetch the additional attribute in a consistent way. Also, non-supporting editing apps might silently discard your new shiny attribute.

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