refactor!: Use Func<Task> for scheduled tasks

EventArgs/ScheduledTaskStartedEventArgs.cs

@@ -0,0 +1,22 @@
+using Xorog.UniversalExtensions.Entities;
+
+namespace Xorog.UniversalExtensions.EventArgs;
+
+public class ScheduledTaskStartedEventArgs : System.EventArgs
+{
+    internal ScheduledTaskStartedEventArgs(ScheduledTask details, Task task)
+    {
+        this.Details = details;
+        this.Task = task;
+    }
+
+    /// <summary>
+    /// The details of this scheduled task.
+    /// </summary>
+    public ScheduledTask Details { get; internal set; }
+
+    /// <summary>
+    /// The task that was executed.
+    /// </summary>
+    public Task Task { get; internal set; }
+}