to check if the report is uploadable.
Move incidentheader.proto to libincident so statds is able to include a lite
proto class for incident header.
Change IncidentReportArgs to add the proto object instead of serialized
bytes to prevent caller gives meaningless data.
Bug: 70241842
Test: push config to statsd and verify incidentd generate the report
with correct header.
Change-Id: If95b655be71047b019b229e5903a08f3c21a1f29
437aa6e8ad