Implements move execution for battle

PkmnLib.Dynamic/Events/Handling/EventBatchId.cs

@@ -8,7 +8,7 @@ namespace PkmnLib.Dynamic.Events;
 /// For example, when a Pokemon gets hurt by poison, we want to show the purple poison animation and the damage at the
 /// same time. This is done by batching the events together.
 /// </remarks>
-public record struct EventBatchId()
+public readonly record struct EventBatchId()
 {
     /// <summary>
     /// The unique identifier for this batch of events.