feat: add BasePower abstraction

Players/Ensure.cs

@@ -0,0 +1,26 @@
+using CounterStrikeSharp.API.Core;
+
+namespace Cs2SuperPowers.Players;
+
+public static class Ensure
+{
+    public static ValidationBuilder<CCSPlayerController> Player(CCSPlayerController? player)
+    {
+        return new ValidationBuilder<CCSPlayerController>(player);
+    }
+}
+
+public class ValidationBuilder<TEntity>(TEntity? entity)
+{
+    private readonly Queue<IValidation<TEntity>> _validations = new();
+
+    public void Add(IValidation<TEntity> validation)
+    {
+        _validations.Enqueue(validation);
+    }
+
+    public bool Check()
+    {
+        return _validations.All(v => v.Validate(entity));
+    }
+}