Grant Launcher permission to access AppSearch

This CL grants aosp launcher the permission to access appsearch to fetch
data that are explicitly made visible to the app that uses the HOME
role. One concrete example are shortcuts, with this CL aosp launchers
will now have the permission to query shortcuts directly from appsearch.

Bug: 254383738
Test: manual
Change-Id: I1a2260c7bde0d52fedff38ae56572101d51abdef