[openstreetmap/openstreetmap-website] More informative embeds (Issue #3580)

[Kaylie]

### Description

Make the changeset embed on platforms like Discord show the changeset comment, time, and potentially even a screenshot of the changeset on the map

### Screenshots

Current 
![image](https://user-images.githubusercontent.com/17483712/175565169-f8202c13-7d88-46c8-bac9-07afd6f23745.png)

Mockup
![image](https://user-images.githubusercontent.com/17483712/175565756-c9bdc723-6c89-4581-8c5b-fbd9f84815df.png)


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