Restrict image size when loading via URI

If images are larger than the maximum, sets a target size in ImageDecoder.
Also moved the scaling logic shared with MediaControlPanel to a util method

Fixes: 261849187
Test: atest MediaDataUtilsTest MediaControlPanelTest
Test: manual - check hprof before/after change
Test: manual - verify both square and rectangular images are not distorted
Change-Id: I997adb11e5c9278bcb54e5f6d6d68c6c1845c709