Add a function to list all files managed by ART Service.

This is going to be used in the "sweep" phase of the GC.

Bug: 254013425
Test: m test-art-host-gtest-art_libarttools_tests
Test: m test-art-host-gtest-art_artd_tests
Test: atest art_standalone_libarttools_tests
Test: atest atest art_standalone_artd_tests
Ignore-AOSP-First: ART Services.
Change-Id: Ie7a5bd6f805c370aa3c2e3a1ab1d5408e4552f83
8 files changed