fix: Reduce High severity issues reported by SonarCloud #2865 (#3103)

* fix: add UnsupportedOperationException in KingsHand and GameLoopTest

* refactor: update DatabaseService to use constant for BINARY_DATA and remove obsolete test files

* refactor: update timePasses method in KingsHand

* refactor CandyGame.java

* refactor: simplify boundary checks in CandyGame

* feat: add getters for type and points in Candy class and initialize logger in CandyGame

* remove class and logger initialization in CandyGame

* Modify CandyGame.java

* fix Checkstyle violations

* Remove generic wildcard type in ThreatAwareSystem

filterer/src/main/java/com/iluwatar/filterer/threat/ThreatAwareSystem.java

@@ -30,7 +30,7 @@ import java.util.List;
 /**
  * Represents system that is aware of threats that are present in it.
  */
-public interface ThreatAwareSystem {
+public interface ThreatAwareSystem<T extends Threat> {
 
   /**
    * Returns the system id.
@@ -43,13 +43,13 @@ public interface ThreatAwareSystem {
    * Returns list of threats for this system.
    * @return list of threats for this system.
    */
-  List<? extends Threat> threats();
+  List<T> threats();
 
   /**
    * Returns the instance of {@link Filterer} helper interface that allows to covariantly
    * specify lower bound for predicate that we want to filter by.
    * @return an instance of {@link Filterer} helper interface.
    */
-  Filterer<? extends ThreatAwareSystem, ? extends Threat> filtered();
+  Filterer<ThreatAwareSystem<T>, T> filtered();
 
 }