Parsing logic for additional elements to support purpose declaration app

compatibility.

Updating PermissionInfo with a map where the keys contain the valid
purposes and the value is the metadata associated with the purpose
itself. Also updated PermissionInfo with the
requirePurposeTargetSdkVersion attribute.

Bug: 422817717
Test: atest PermissionInfoTest ParsedPermissionTest ParsedValidPurposeTest PackageStateTest
Flag: android.permission.flags.purpose_declaration_enabled
Change-Id: Ica86cc49d8455da7704ebfb02fa9464a653c4162