Changesets/Users: Add user heatmap / additional copy buttons

[danieldegroot2]

What feature would you like to see added?

Add (custom-made, or integration/improvement for osm.org's existing) heatmap to user profiles. Allow users to click on one (or more) days (or months) in the heatmap and return filter for user + time range. (perhaps clear old filters first)

See also https://github.com/openstreetmap/openstreetmap-website/pull/5402, https://github.com/openstreetmap/openstreetmap-website/pull/5805

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These might be considered as (indirectly) opening different views for the same (section of) the page, so to implement/use/comprehend it might be hard/unfeasible.

Alternatively, add more copy buttons where needed. (username, date, metadata, keys/values/tags/objects/locations)

Why would this be useful to you or other users?

Allow users to more quickly inspect user activity for given period.

Currently user has to write/copy this manually in the filters page.

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Related #178 (allow easily filtering/sharing user's edits via URL),

See also #165 (allow showing a geographical (heat)map, in this case filtered to selection from chronological heatmap)