Implements more abilities

PkmnLib.Dynamic/Events/TerrainChangeEvent.cs

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+using PkmnLib.Static.Utils;
+
+namespace PkmnLib.Dynamic.Events;
+
+public class TerrainChangeEvent : IEventData
+{
+    public StringKey? OldTerrain { get; }
+    public StringKey? NewTerrain { get; }
+
+    public TerrainChangeEvent(StringKey? oldTerrain, StringKey? newTerrain)
+    {
+        OldTerrain = oldTerrain;
+        NewTerrain = newTerrain;
+    }
+
+    /// <inheritdoc />
+    public EventBatchId BatchId { get; init; }
+}