Added fast cloner and benchmarks

Benchmarks/Program.cs

@@ -0,0 +1,12 @@
+using BenchmarkDotNet.Running;
+
+namespace Benchmarks;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        var summary = BenchmarkRunner.Run<ClonerBenchmarks>();
+        Console.WriteLine(summary);
+    }
+}