Benchmarks reworked to save time on test data creation & have more comparable results against baseline.

Recyclable.Collections.Benchmarks/POC/RecyclableListPoc.Benchmarks.IndexOf.cs

@@ -1,5 +1,4 @@
-using BenchmarkDotNet.Attributes;
-using Microsoft.Extensions.ObjectPool;
+using Microsoft.Extensions.ObjectPool;
 using Recyclable.Collections.Parallel;
 using Recyclable.Collections.Pools;
 using System.Buffers;
@@ -4654,7 +4653,7 @@ namespace Recyclable.Collections.Benchmarks.POC
 			}
 		}
 	}
-	
+
 	#endregion
 
 	public partial class RecyclableListPocBenchmarks