Conversion Reports: Handle retrieved conversion reports
 * Only schedule initial conversion report request if config says so
 * Dig report type out of the report AppNexus response (AppNexusApiClient.Reporting.cs)
 * Map AppNexus report object report type to AppNexusReportType (RetrieveCampaignReportActivity.RetrieveReport)
 * Implement stub DynamicAllocationActivityTasks.GetCampaignConversionDataActivity