[openstreetmap/openstreetmap-website] Implement JSON support for the changeset download API (PR #5973)

[Jochen Topf]

joto left a comment (openstreetmap/openstreetmap-website#5973)

I could never understand why there are the `create`, `modify`, and `delete` actions in the osmChange format, or why there is an osmChange format at all. Why not use the format that the history file uses: A version 1 is a basically a create, any larger version a modify, if the `visible` flag is not set, it is a delete. Osmium has always handled it this way internally. Any implementation has to handle the case anyway that you get a `create` for something that's already there (which makes it into a `modify`) or some other corner cases like this.

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