Add healing effect resource and integrate into game systems

Code/Resources/HealEffectResource.cs

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+using Godot;
+
+namespace CryptonymThunder.Code.Resources;
+
+[GlobalClass]
+public partial class HealEffectResource : EffectResource
+{
+    [Export(PropertyHint.Range, "1,1000,1")] public float Amount { get; set; } = 10f;
+}

Code/Resources/HealEffectResource.cs.uid

@@ -0,0 +1 @@
+uid://dh30an2xwhfgu