Add new resources and presenters for item pickups and effects

Code/Resources/Effects/ConsumeAmmoCostResource.cs

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+using Godot;
+
+namespace CryptonymThunder.Code.Resources.Effects;
+
+[GlobalClass]
+public partial class ConsumeAmmoCostResource : EffectResource
+{
+    [Export] public string AmmoId { get; set; } = "ammo_bullets";
+    [Export(PropertyHint.Range, "1,100,1")] public int Amount { get; set; } = 1;
+}

Code/Resources/Effects/ConsumeAmmoCostResource.cs.uid

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+uid://b6argm77cho2t