Split ProcessRecord into separate cpp/h files am: e5522684a1 am: 20e1fd4a9d am: 3d073fedea

Original change: https://android-review.googlesource.com/c/platform/system/memory/libmeminfo/+/2239335

Change-Id: Ide67d9bb2ea04c845f5d3a2982f644e2fd1ade86
Signed-off-by: Automerger Merge Worker <[email protected]>