[PM] Change LauncherIconConfig (2/N)

- Parse the two attributes alternateIcons and alternateLabels
- The maximum of the length of TypedArray is 500. Only parse and
  reserve first 500 ids.

Flag: android.content.pm.change_launcher_badging
Test: atest AndroidPackageTest
Bug: 374004639
Change-Id: Iec04e961d55adadb5de425887f5de95a2fa4425a