Admixer Bid Adapter: add meta key to response (#6674)

Author: AdmixerTech

modules/admixerBidAdapter.js

@@ -75,6 +75,10 @@ export const spec = {
           currency: bidResponse.currency,
           vastUrl: bidResponse.vastUrl,
           dealId: bidResponse.dealId,
+          /**
+          * currently includes meta.advertiserDomains ; networkId ; advertiserId
+          */
+          meta: bidResponse.meta,
         };
         bidResponses.push(bidResp);
       });

test/spec/modules/admixerBidAdapter_spec.js

@@ -103,6 +103,7 @@ describe('AdmixerAdapter', function () {
           'netRevenue': false,
           'bidId': '5e4e763b6bc60b',
           'dealId': 'asd123',
+          'meta': {'advertiserId': 123, 'networkId': 123, 'advertiserDomains': ['test.com']}
         }]
       }
     };
@@ -122,6 +123,7 @@ describe('AdmixerAdapter', function () {
           'netRevenue': ads[0].netRevenue,
           'ttl': ads[0].ttl,
           'dealId': ads[0].dealId,
+          'meta': {'advertiserId': 123, 'networkId': 123, 'advertiserDomains': ['test.com']}
         }
       ];