Add inventory and pickup components with associated resources and presenters

Code/Resources/PickupComponentResource.cs

@@ -0,0 +1,11 @@
+using Godot;
+
+namespace CryptonymThunder.Code.Resources;
+
+[GlobalClass]
+public partial class PickupComponentResource : Resource
+{
+    [Export] public string ItemId { get; set; }
+    [Export] public int Quantity { get; set; } = 1;
+    [Export] public bool IsInstantUse { get; set; } = false;
+}