Initial work on implementing Pokemon

PkmnLib.Dynamic/Events/Handling/EventBatchId.cs

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+namespace PkmnLib.Dynamic.Events;
+
+/// <summary>
+/// Allows for the batching of multiple events that should be shown at the same time.
+/// </summary>
+/// <remarks>
+/// This is useful for when we send multiple events to the client in sequence, but we want to show them in one go.
+/// 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()
+{
+    /// <summary>
+    /// The unique identifier for this batch of events.
+    /// </summary>
+    public Guid Id { get; init; } = Guid.NewGuid();
+}

PkmnLib.Dynamic/Events/Handling/EventData.cs

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+namespace PkmnLib.Dynamic.Events;
+
+/// <summary>
+/// An event is something that happens during a battle. This can be used by front-end code to
+/// display information about the battle to the user. This is the only way for the front-end to
+/// know what is happening in the battle.
+/// </summary>
+public interface IEventData
+{
+    public EventBatchId BatchId { get; init; }
+}

PkmnLib.Dynamic/Events/Handling/EventHook.cs

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+namespace PkmnLib.Dynamic.Events;
+
+/// <summary>
+/// The event hook of a battle. This is used to hook into the battle and get notified when something
+/// happens that a front-end might want to know about.
+/// </summary>
+public class EventHook
+{
+    /// <summary>
+    /// The event handler that is called when the event is triggered.
+    /// </summary>
+    public event EventHandler<IEventData>? Handler;
+    
+    /// <summary>
+    /// Triggers the event, calling the handler with the given data.
+    /// </summary>
+    public void Invoke(IEventData data)
+    {
+        Handler?.Invoke(this, data);
+    }
+}