Move shared library info out of PackageManagerService (2/n)

- Adding tests for SharedLibrariesImpl
- Rename SharedLibraryHelper to SharedLibraryUtils

Bug: 200588896
Test: atest StaticSharedLibsHostTests
Test: atest SharedLibrariesImplTest
Change-Id: I7f03720f54ae14b68ba7531f4f407a99d361a680
7 files changed