Possibility to use memories as gallery in the app instead of the default gallery if installed

### Is your feature request related to a problem? Please describe.
Well more or less.
The speed of the gallery for more than 1 Million Pictures is very slow. In have installed memories to solve this issue.
The problem is that in the nextcloud app, you cannot use the new memories, so the gallery there is very very slow.

### Describe the solution you'd like
Possibility to choose between memories and default gallery in the apps settings.
Alternative use memories if installed otherwise fallback to gallery default.