[ADI][33/N] expose appMetadataVerified status as a public API

API-Coverage-Bug: 420966373

BUG: 360129657
FLAG: android.content.pm.verification_service
Test: atest android.content.pm.cts.PackageInfoTest
Test: atest CtsRootDeveloperVerificationPrivInstallerTarget36TestCases CtsRootDeveloperVerificationInstallerTarget36TestCases CtsRootDeveloperVerificationPrivInstallerTarget35TestCases CtsRootDeveloperVerificationInstallerTarget35TestCases CtsRootDeveloperVerificationVerifierTestCases

Change-Id: I1d01e1c16eedee8eea5d171e9246413ce41d07ce