[openstreetmap/openstreetmap-website] add link to open view in OSMCha, from changesets history pge (#2629)

[Mikel Maron]

[OSMCha](https://osmcha.org/) has a simple and full featured to examine the details of changesets. The OSM.org history page for changesets in a bbox or by a user is somewhat functionally limited. Adding a small link to OSMCha from the history page would make this service more discoverable and convenient.

Implementation (which myself or @willemarcel would look into) looks to only require a small modification to the [view](https://github.com/openstreetmap/openstreetmap-website/blob/master/app/views/changesets/history.html.erb) to add in links along the lines of these

<pre>
https://osmcha.org/?filters={%22users%22:[{%22label%22:%22wille%22,%22value%22:%22wille%22}]}
https://osmcha.org/?filters=%7B%22in_bbox%22%3A%5B%7B%22label%22%3A%22-77.1593%2C38.8073%2C-76.9011%2C39.0082%22%2C%22value%22%3A%22-77.1593%2C38.8073%2C-76.9011%2C39.0082%22%7D%5D%7D
</pre>

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