delete more code

Author: khvn26

src/main/java/com/flagsmith/FlagsmithClient.java

@@ -12,14 +12,10 @@
 import com.flagsmith.interfaces.FlagsmithSdk;
 import com.flagsmith.mappers.EngineMappers;
 import com.flagsmith.models.BaseFlag;
-import com.flagsmith.models.FeatureStateModel;
 import com.flagsmith.models.Flags;
-import com.flagsmith.models.SdkTraitModel;
 import com.flagsmith.models.Segment;
-import com.flagsmith.models.TraitModel;
 import com.flagsmith.threads.PollingManager;
 import com.flagsmith.utils.ModelUtils;
-import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;