1. Implement Privacy Policy Tag Inheritance

2. Expose Dest values in IIncidentReportArgs.h

Please see bug for detail descriptions.

Bug: 67869340
Test: unit tested and on-device test. Ran command:
$ out/host/linux-x86/bin/incident-section-gen incidentd
to test various of privacy taggings.
Change-Id: I12af3d7da4c7c72bd63598893fe2c1f70b09baa4