Add logic for recording dex files use on disk

Add PackageDexUsage to handle the I/O operations of dex usage data. It
is responsible to encode, save and load dex

Test: runtest -x .../PackageDexUsageTests.java

Bug: 32871170

(cherry picked from commit 0318162a)

Change-Id: I6d483d480d62aa14cb1663560fd88092469a2835