feat: progression trackers added

Engine.Core/Helpers/Progression/IReadOnlyProgressionTracker.cs

@@ -0,0 +1,13 @@
+namespace Syntriax.Engine.Core;
+
+public interface IReadOnlyProgressionTracker
+{
+    event ProgressionUpdatedEventHandler? OnUpdated;
+    event ProgressionEndedEventHandler? OnEnded;
+
+    float Progression { get; }
+    string Status { get; }
+
+    delegate void ProgressionUpdatedEventHandler(IReadOnlyProgressionTracker sender, float previousProgression, string previousStatus);
+    delegate void ProgressionEndedEventHandler(IReadOnlyProgressionTracker sender);
+}