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

[Wille Marcel]

@woodpeck the "modify the map" permission is required to post comments to a changeset from OSMCha.

About the authentication, we started requiring it because the [LWG position paper about GDPR](https://wiki.openstreetmap.org/wiki/File:GDPR_Position_Paper.pdf) recommended to expose metadata only to authenticated users. As OSMCha shows metadata both from changesets and from each map feature and hide metadata from anonymous users would mean like build a new system, we decided to simply require authentication for everything.

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