Relocate load_maps to libmeminfo from android_os_Debug JNI library

- Extract the load_maps implementation into a separate library ExtractAndroidProcHeaps
- Rename load_maps to ExtractAndroidHeapStats
- Reuse in carwatchdog native implementation

Bug: 323589060
Change-Id: I938e959b843e64adf9edd4b87f7522bfce791e41
Test: atest libmeminfo_test
NO_IFTTT=will be handled in the ag/26663866
5 files changed