Implement Weighted Moving Average (WMA) and Multi-Period WMA (WmaVector) classes with O(1) update complexity

- Added Wma class for calculating the Weighted Moving Average with detailed documentation and optimized performance using dual running sums.
- Introduced WmaVector class to handle multiple WMAs simultaneously, supporting batch calculations and real-time updates.
- Implemented last-value substitution for handling invalid inputs (NaN/Infinity) in both classes.
- Created comprehensive unit tests for Wma and WmaVector to ensure accuracy and reliability of calculations.
- Updated documentation to include usage examples, mathematical foundations, and performance characteristics.

.vscode/extensions.json

@@ -2,6 +2,7 @@
     "recommendations": [
         "ms-dotnettools.csdevkit",
         "ms-dotnettools.csharp",
+        "ms-dotnettools.dotnet-interactive-vscode",
         "bierner.markdown-mermaid"
     ]
 }