Refactor: private fields and performance tweaks (#9625)

1a. Make `costs`, `manaCosts`, and `manaCostsToPay` private in `AbilityImpl` with access through getters/setters 
1b. fix cost adjuster for imprinted cards affected by the above

2a. Lazy instantiation for rarely used `data` field in `TargetPointerImpl`

3a. Pre-allocate certain array sizes in `Modes` and `CostsImpl`

4a. Make `manaTemplate` private in `BasicManaEffect`, copy when passing outside the class 
4b. Don't copy `manaTemplate` in copy constructor since it doesn't change 
4c. Add comments explaining copy usage for `manaTemplate` 
4d. Remove redundant variable assignment and make fields final 

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Co-authored-by: xenohedron <xenohedron@users.noreply.github.com>

Mage/src/main/java/mage/abilities/LoyaltyAbility.java

@@ -70,7 +70,7 @@ public class LoyaltyAbility extends ActivatedAbilityImpl {
 
         // cost modification support only 1 cost item
         int staticCount = 0;
-        for (Cost cost : costs) {
+        for (Cost cost : getCosts()) {
             if (cost instanceof PayLoyaltyCost) {
                 // static cost
                 PayLoyaltyCost staticCost = (PayLoyaltyCost) cost;