added FastHash benchmark (#5029)

Author: Aaronontheweb

src/benchmark/Akka.Benchmarks/Remoting/FastHashBenchmarks.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Akka.Benchmarks.Configurations;
+using Akka.Remote.Serialization;
+using BenchmarkDotNet.Attributes;
+
+namespace Akka.Benchmarks.Remoting
+{
+    [Config(typeof(MicroBenchmarkConfig))]
+    public class FastHashBenchmarks
+    {
+        public const string HashKey1 = "hash1";
+
+        [Benchmark]
+        public int FastHash_OfString()
+        {
+            return FastHash.OfString(HashKey1);
+        }
+
+        [Benchmark]
+        public int FastHash_OfStringUnsafe()
+        {
+            return FastHash.OfStringFast(HashKey1);
+        }
+    }
+}

src/core/Akka.API.Tests/CoreAPISpec.ApproveRemote.approved.txt

@@ -1,4 +1,5 @@
 [assembly: System.Reflection.AssemblyMetadataAttribute("RepositoryUrl", "https://github.com/akkadotnet/akka.net")]
+[assembly: System.Runtime.CompilerServices.InternalsVisibleToAttribute("Akka.Benchmarks")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleToAttribute("Akka.Cluster")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleToAttribute("Akka.Cluster.Metrics")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleToAttribute("Akka.Cluster.Sharding")]

src/core/Akka.Remote/Properties/AssemblyInfo.cs

@@ -34,3 +34,4 @@
 [assembly: InternalsVisibleTo("Akka.Cluster.Tools")]
 [assembly: InternalsVisibleTo("Akka.Cluster.Sharding")]
 [assembly: InternalsVisibleTo("Akka.Cluster.Metrics")]
+[assembly: InternalsVisibleTo("Akka.Benchmarks")]