Update RankStrategyBy683: add apollo config rank.score.neg_sample_rate

ad-engine-service/src/main/java/com/tzld/piaoquan/ad/engine/service/score/strategy/RankStrategyBy683.java

@@ -43,7 +43,8 @@ public class RankStrategyBy683 extends RankStrategyBasic {
     @ApolloJsonValue("${rank.score.weight.680:{}}")
     private Map<String, Double> weightMap;
 
-    final static double negSampleRate = 0.01;
+    @ApolloJsonValue("${rank.score.neg_sample_rate:0.01}")
+    Double negSampleRate;
 
     @Override
     public List<AdRankItem> adItemRank(RankRecommendRequestParam request, ScoreParam scoreParam) {