Automatically save Images to Gallery

### Your use case

#### What would you like to do?
I would like to activate an setting in the app to automatically download Images to an elementx image folder. At the moment i have to remember to download every image i receive individually and then move it from the Downloads folder into a folder that is listed in my phones gallery app and also point my image backup app to this folder.
This Issue exist for years with element: https://github.com/element-hq/element-android/issues/2660

#### Why would you like to do it?
The Downloadsfolder contains various files from different apps and most of them are one time use only. Like QR-Codes for theatre tickets, Images from restaurant websites and so on. A dedicated elementX Media Folder (for pictures and videos, like whatsapp does it) would help to find the image in the gallery app. This also is nice, to backup my images to nextcloud or something else with automated image uploading, but for this the images have to be saved to a dedicated folder.

#### How would you like to achieve it?
I would like to activate the feature in the settings (the default can stay deactivated). If the Downloadfolder should stay the default location for saved Media, there should be an option to change the location. Additionally the activation of this feature could be activated on a per Room basis.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_

### Are you willing to provide a PR?

Yes