AI Sideboarding Mode toggle as a Preferences option (#5136)

* - Initial commit for the AI sideboarding mode toggle.

* - Tweak the parameter value to correspond to the enum.

* - Consistency.

forge-game/src/main/java/forge/game/GameRules.java

@@ -11,6 +11,7 @@ public class GameRules {
     private int gamesToWinMatch = 2;
     private boolean playForAnte = false;
     private boolean matchAnteRarity = false;
+    private boolean AISideboardingEnabled = false;
     private boolean sideboardForAI = false;
     private final Set<GameType> appliedVariants = EnumSet.noneOf(GameType.class);
 
@@ -77,6 +78,14 @@ public class GameRules {
         sideboardForAI = sideboard;
     }
 
+    public boolean getAISideboardingEnabled() {
+        return AISideboardingEnabled;
+    }
+
+    public void setAISideboardingEnabled(final boolean aiSideboarding) {
+        AISideboardingEnabled = aiSideboarding;
+    }
+
     public int getGamesToWinMatch() {
         return gamesToWinMatch;
     }