Implement notifyDexLoad.

This CL implements notifyDexLoad by adding a class `DexUseManager` to
maintain the information about dex uses and answer queries.

The persistence of the information is not in the scope of this CL.

Bug: 249984283
Test: atest ArtServiceTests
Ignore-AOSP-First: ART Services.
Change-Id: I23f651f013672defb2e61af0a744ff6e6d128bfb
11 files changed