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/ActivatedAbilityImpl.java

@@ -193,7 +193,7 @@ public abstract class ActivatedAbilityImpl extends AbilityImpl implements Activa
         }
 
         // targets and costs check
-        if (!costs.canPay(this, this, playerId, game)
+        if (!getCosts().canPay(this, this, playerId, game)
                 || !canChooseTarget(game, playerId)) {
             return ActivationStatus.getFalse();
         }