Add TBar, TBarSeries, TSeries, TValue, and IFeed implementations with comprehensive documentation and examples

- Introduced TBar struct for efficient OHLCV data representation.
- Implemented TBarSeries class for high-performance collection of TBar instances using Structure of Arrays (SoA) layout.
- Added TSeries class for time-series data management with zero-copy access.
- Created TValue struct for time-value pairs with implicit conversions.
- Defined IFeed interface for consistent data feed implementations.
- Developed CsvFeed class for loading historical OHLCV data from CSV files.
- Implemented GBM class for generating synthetic financial data using Geometric Brownian Motion.
- Added Quantower project files for Averages indicator with necessary dependencies and configurations.
- Included extensive usage examples and notebooks for TBar, TBarSeries, TSeries, TValue, and feed implementations.

lib/core/tbarseries/TBarSeries.Notebook.dib

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+#!meta
+
+{"kernelInfo":{"defaultKernelName":"csharp","items":[{"aliases":[],"languageName":"csharp","name":"csharp"}]}}
+
+#!csharp
+
+// Reference the library
+#r "..\..\bin\QuanTAlib.dll"
+
+using QuanTAlib;
+
+// 1. Creating a TBarSeries
+// TBarSeries is a collection of bars stored in Structure of Arrays (SoA) format
+// This layout is optimized for performance and SIMD operations
+
+var bars = new TBarSeries();
+long now = DateTime.UtcNow.Ticks;
+
+// Add a new bar
+var bar1 = new TBar(now, 100, 105, 95, 102, 1000);
+bars.Add(bar1, isNew: true);
+
+Console.WriteLine($"Added Bar 1: Count={bars.Count}");
+Console.WriteLine($"Last Close: {bars.Last.Close}");
+
+#!csharp
+
+// 2. Streaming Updates
+// TBarSeries supports updating the last bar in place
+// This is crucial for real-time feeds where the current bar changes until it closes
+
+// Update the bar (e.g. price changed within the same minute)
+var bar1Update = new TBar(now, 100, 106, 95, 104, 1500);
+bars.Add(bar1Update, isNew: false);
+
+Console.WriteLine($"Updated Bar 1: Count={bars.Count} (Count should not increase)");
+Console.WriteLine($"Last Close: {bars.Last.Close}");
+Console.WriteLine($"Last High: {bars.Last.High}");
+
+#!csharp
+
+// 3. Zero-Copy Views
+// You can access individual components (Open, High, Low, Close, Volume) as TSeries
+// These views share the underlying memory, so no copying is involved
+
+Console.WriteLine($"Bars Count: {bars.Count}");
+Console.WriteLine($"Close Series Count: {bars.Close.Count}");
+Console.WriteLine($"Close Series Last: {bars.Close.Last.Value}");
+
+// Verify view updates automatically
+Console.WriteLine("\nAdding new bar...");
+bars.Add(now + TimeSpan.TicksPerMinute, 104, 108, 103, 107, 2000, isNew: true);
+
+Console.WriteLine($"Bars Count: {bars.Count}");
+Console.WriteLine($"Close Series Count: {bars.Close.Count} (Should match Bars Count)");
+Console.WriteLine($"Close Series Last: {bars.Close.Last.Value} (Should be 107)");
+
+#!csharp
+
+// 4. Aliases and Direct Access
+// TBarSeries provides short aliases (O, H, L, C, V) and direct access properties
+
+Console.WriteLine($"Alias Access (C.Last): {bars.C.Last.Value}");
+Console.WriteLine($"Direct Last Access (LastClose): {bars.LastClose}");
+Console.WriteLine($"Direct Last Time (LastTime): {new DateTime(bars.LastTime)}");
+
+#!csharp
+
+// 5. Iteration
+// You can iterate over the bars or individual series
+
+Console.WriteLine("\nIterating over bars:");
+foreach (var bar in bars)
+{
+    Console.WriteLine($"  {bar}");
+}
+
+Console.WriteLine("\nIterating over Close prices:");
+for (int i = 0; i < bars.Count; i++)
+{
+    Console.WriteLine($"  Bar {i}: Close={bars.Close[i].Value}");
+}