Refactor: Remove unnecessary using directives across multiple files

- Cleaned up code by removing unused using directives from various test and implementation files in the trends and volume directories.
- This includes files related to HMA, HTIT, JMA, KAMA, LSMA, MAMA, MGDI, PWMA, RMA, SMA, SSF, SUPER, T3, TEMA, TRIMA, USF, VIDYA, WMA, ATR, ADL, and ADOSC.
- Improved code readability and maintainability by streamlining imports.

lib/feeds/gbm/ValidationTestData.cs

@@ -1,5 +1,3 @@
-using System;
-using System.Collections.Generic;
 using Skender.Stock.Indicators;
 
 namespace QuanTAlib.Tests;
@@ -216,4 +214,4 @@ public sealed class ValidationTestData : IDisposable
         // No unmanaged resources to dispose
         // Implemented for IDisposable pattern compatibility with test fixtures
     }
-}
+}