fwssp: Add iframe usersync (#4245)

Author: AntoxaAntoxic

src/main/resources/bidder-config/freewheelssp.yaml

@@ -8,6 +8,13 @@ adapters:
         enabled: false
         endpoint: "https://prebid.v.fwmrm.net/ortb/ssp"
         endpoint-compression: gzip
+        usersync:
+          enabled: true
+          cookie-family-name: fwssp
+          iframe:
+            url: https://user-sync.fwmrm.net/ad/u?mode=pbs-user-sync&gdpr={{gdpr}}&gdpr_consent={{gdpr_consent}}&us_privacy={{us_privacy}}&pbs_redirect={{redirect_url}}
+            support-cors: false
+            uid-macro: '#{user.id}'
     meta-info:
       maintainer-email: [email protected]
       app-media-types: