Add healing effect resource and integrate into game systems

Code/Factories/EffectFactory.cs

@@ -18,6 +18,7 @@ public class EffectFactory
             DamageEffectResource damage => new DamageEffect(damage.Amount),
             HitscanEffectResource hitscan => new HitscanEffect(hitscan.Range),
             ConsumeAmmoCostResource consumeAmmo => new ConsumeAmmoCost(consumeAmmo.AmmoId, consumeAmmo.Amount),
+            HealEffectResource heal => new HealEffect(heal.Amount),
             _ => throw new ArgumentOutOfRangeException(nameof(resource),
                 $"Effect type {resource.GetType().Name} not recognized")
         };