Slight cleanup, do some TODOs

PkmnLib.Dynamic/StaticHelpers.cs

@@ -5,11 +5,17 @@ namespace PkmnLib.Dynamic;
 /// </summary>
 public static class StaticHelpers
 {
+    /// <summary>
+    /// A delegate that provides the current date and time.
+    /// </summary>
+    public delegate DateTimeOffset DateTimeProviderDelegate();
+
     /// <summary>
     /// A function to get the current date and time. This can be replaced in cases where the date and time
     /// may not be the same as the system time.
     /// </summary>
-    public static Func<DateTimeOffset> DateTimeProvider { get; set; } = () => DateTimeOffset.Now;
+    [PublicAPI]
+    public static DateTimeProviderDelegate DateTimeProvider { get; set; } = () => DateTimeOffset.Now;
 
     /// <summary>
     /// Get the current date and time.