[Enhancement] Loading gallery by parts

[BoBkiNN]

Is your feature request related to a problem? Please describe.
When I open app, it takes about 5 seconds to load gallery

Describe the solution you'd like
I want to make timeline screen load items (not about thumbnails) piece by piece, for example by 100 items to display recent media as soon as possible without need to wait. There may be option to disable/enable this

Describe alternatives you've considered
Alternative is to wait for gallery to load

Additional context
As I found in code, app queries all rows in MediaStore in one request. I think this is might be why it slow. Currently I have 20k media files