RecyclableCollectionsBenchmarks split into multiple files.

Recyclable.Collections.Benchmarks/Benchmarks/RemoveAt_FirstItems.cs

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+using BenchmarkDotNet.Attributes;
+using Collections.Pooled;
+
+namespace Recyclable.Collections.Benchmarks
+{
+	public partial class RecyclableCollectionsBenchmarks
+	{
+		//[Benchmark(Baseline = false)]
+		public void List_RemoveAt_FirstItems()
+		{
+			var data = TestObjects;
+			var list = new List<object>(data);
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				list.RemoveAt(i);
+			}
+		}
+
+		//[Benchmark(Baseline = true)]
+		public void PooledList_RemoveAt_FirstItems()
+		{
+			var data = TestObjects;
+			using var list = new PooledList<object>(data, ClearMode.Always);
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				list.RemoveAt(i);
+			}
+		}
+
+		//[Benchmark(Baseline = false)]
+		public void RecyclableArrayList_RemoveAt_FirstItems()
+		{
+			var data = TestObjects;
+			using var list = new RecyclableArrayList<object>(data);
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				list.RemoveAt(i);
+			}
+		}
+
+		//[Benchmark(Baseline = false)]
+		public void RecyclableList_RemoveAt_FirstItems()
+		{
+			var data = TestObjects;
+			using var list = new RecyclableList<object>(data, minBlockSize: BlockSize, expectedItemsCount: TestObjectCount);
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				list.RemoveAt(i);
+			}
+		}
+	}
+}