Move android.media.Image* from media to core

This moves android.media.Image* classes and the corresponding jni files
from media/ to core/. The jni files are moved from libmedia to
libandroid_runtime in the process.
This will allow making them accessible from host builds without the need
to make a host version of libmedia.

Flag: EXEMPT refactor
Bug: 382086021
Test: existing tests
Change-Id: If6a3ab4ef45945976b6d40e61e81ea67a4cfe61d