`PackageManager` info objects under Ravenwood.

Many tests across the OS are already writing tests where they "mock"
their own responses from `PackageManager`, primarily by filling in
the "info" objects that it returns.

Since these are simple data structures that primarily hold static
data, let's opt-in under Ravenwood, so that other tests can
construct for their own internal uses.  Complex dynamic operations,
such as loading drawables, remain opted-out.

This change brings along relevant CTS, but ignores several tests that
currently depend on a fully-running PackageManager service.  To
ensure we have solid coverage, new `testSimple` is added.

Bug: 292141694
Test: atest CtsContentTestCasesRavenwood
Change-Id: Ie9682184cb5250f649426947bcf353802918ce50

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