feat: Introduce ITValuePublisher interface and refactor indicators for event-driven value updates.

lib/core/tseries/ITValuePublisher.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace QuanTAlib;
+
+/// <summary>
+/// Interface for objects that publish TValue updates.
+/// </summary>
+public interface ITValuePublisher
+{
+    /// <summary>
+    /// Event triggered when a new TValue is available.
+    /// </summary>
+    event Action<TValue> Pub;
+}

lib/core/tseries/tseries.cs

@@ -11,8 +11,8 @@ namespace QuanTAlib;
 /// Stores Time (long) and Value (double) in separate contiguous arrays for SIMD efficiency.
 /// Supports "New Bar" vs "Update Last" streaming semantics.
 /// </summary>
-public class TSeries : IReadOnlyList<TValue>
-{
+    public class TSeries : IReadOnlyList<TValue>, ITValuePublisher
+    {
     protected readonly List<long> _t;
     protected readonly List<double> _v;