[pm] add PackageInfo.getArchiveTimeMillis API

New field to show when the app was archived for a user.

Next step is to reset it to zero after package reinstall.

BUG: 310027113
Test: atest
android.content.pm.cts.PackageInstallerArchiveTest#testGetArchiveTimeMillis

Change-Id: I42abc73c49f2449438212efc89c990b99cfa9bbb