feat(auto_balancer): add missing method (#2066)

Signed-off-by: Shichao Nie <[email protected]>

Author: SCNieh

core/src/main/java/kafka/autobalancer/model/AbstractInstanceUpdater.java

@@ -280,6 +280,10 @@ public boolean isTrusted() {
             return trusted;
         }
 
+        public void setTrusted(boolean isTrusted) {
+            this.trusted = isTrusted;
+        }
+
         public double getValue() {
             return value;
         }