Add new API to retrieve app names in a batch

Change-Id: I57e5c132bc58a32d70007a7a105775b526ff7bb9
Fixes: 62805090
Test: cts-tradefed run commandAndExit cts-dev -m CtsContentTestCases -t android.content.pm.cts.PackageManagerTest#testGetNamesForUids_null
Test: cts-tradefed run commandAndExit cts-dev -m CtsContentTestCases -t android.content.pm.cts.PackageManagerTest#testGetNamesForUids_empty
Test: cts-tradefed run commandAndExit cts-dev -m CtsContentTestCases -t android.content.pm.cts.PackageManagerTest#testGetNamesForUids_valid