Move shared library info out of PackageManagerService (1/n)

Introduce a new class SharedLibrariesImpl in this cl. Moving the
shared library info and relating functions into it.

Bug: 200588896
Test: atest StaticSharedLibsHostTests
Test: atest PackageManagerTest
Change-Id: I1fbc6d4b93c5801cb493746b5c844da33db39092
11 files changed