Track resources separately in java_import

java_import currently collects the "implementation and resource jar"
from each of its dependencies.  This results in different resource
conflict resolution than other java modules, which collect
implementation jars and resource jars separately.  Modify java_import
to match the other module types.

Flag: EXEMPT refactor
Test: all soong tests pass
Change-Id: I06134e2621582799b3a525d2c12b900b8d86d171