Put thread pool to individual type define as thread resource manager.

StgSharp.Common/Collections/CapacityFixedBag.cs

@@ -28,6 +28,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Reflection;
 
 namespace StgSharp.Collections
 {
@@ -72,6 +73,16 @@ namespace StgSharp.Collections
             }
         }
 
+        public void RemoveAt(int index)
+        {
+            if (index >= 0)
+            {
+                _buffer[index] = _buffer[Count - 1];
+                _buffer[Count - 1] = default!;
+                Count--;
+            }
+        }
+
         IEnumerator IEnumerable.GetEnumerator()
         {
             return GetEnumerator();