Improve the debug info from overlay lookup

Print the best matching configuration from the given resource while
looking up for better understanding why an overlay isn't taken.

Bug: 193701453
Test: atest AssetManager2Test libandroidfw_tests
Test: manually install a target package has values and values-en,
      and an overlay package only has values. Then, use overlay
      lookup command to check if the output shows related info.
Change-Id: I0cb415b9e932e1d4bfd0be2e1768adeb78e7b7d0