Storage Settings Apps category shows image/video/audio APPs

There is AOSP built in file browser for image/video/audio
file category, all APPs except games should be included in
Apps category.

- Shows image/video/audio APPs in APPs category.
- Count Image/Video/Audio APPs storage size to Apps storage size.
- Remove APP size & cache size for Images/Videos/Audios category.

Bug: 170918505
Test: atest StorageAsyncLoaderTest.java
Change-Id: I07e0a3a66a13f36b9e0cbde289d8ba90df4ae295