[openstreetmap/openstreetmap-website] Add a basic when-last-changed feature to the history pages (PR #3535)

[watmildon]

Just found out about this proposed change and wanted to say it would be super super helpful with some of the QA stuff I have been doing (normalization of gnis:feature_id tagged objects). I usually end up heading into JOSM which offers a similar experience but it would rule if this way on the site.

@JesseWeinstein was curious about the performance in JOSM for objects with long histories so here's some anecdata:
r26621 (~3200 versions) = 13 seconds
w885527284 (~2500 versions) = 9 seconds

Thanks everyone for working toward getting it finished and deployed! 

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