Rich workspaces: Support callouts

### Is your feature request related to a problem? Please describe.
In the Nextcloud Text app there was added support for Callouts (Info, Success, Warning, Danger). Using them renders nicely in the web view, but in the App folder view they are not rendered and appear as `::: info`, … (when opening the file they are rendered :+1:).

### Describe the solution you'd like
Also support the rendering of Callouts in the NC Android app folder view.

### Describe alternatives you've considered
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### Additional context
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### Version
Android: 13
NC App: 3.23.1