Grid view to look for pictures

### Please agree to the following

- [X] I have searched [existing issues](https://github.com/cryptomator/android/issues?q=) for duplicates
- [X] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/android/blob/develop/.github/CODE_OF_CONDUCT.md)

### Summary

Having a grid view will add great benefit to look through pictures

### Motivation

The current view by default is list view for all kinds of files. If there’s an option to view the files in grid view, it’ll be easy to look for the pictures provided a thumbnail can be generated for preview. I know I can swipe left out right, but having to be able to see the image preview without opening it would be a great addition. Having multiple sizes of grid would be even great

### Considered Alternatives

_No response_

### Anything else?

_No response_