Add type switch matching benchmark (#3599)

Robust.Benchmarks/TypeMatching/TypeSwitchBenchmark.cs

@@ -0,0 +1,71 @@
+using BenchmarkDotNet.Attributes;
+using Robust.Shared.Analyzers;
+
+namespace Robust.Benchmarks.TypeMatching;
+
+[MemoryDiagnoser]
+[Virtual]
+public class TypeSwitchBenchmark
+{
+    private readonly Matcher<Struct> _matcher = new();
+
+    [Benchmark]
+    public int BenchmarkInt()
+    {
+        return _matcher.TypeToInt<int>();
+    }
+
+    [Benchmark]
+    public int BenchmarkString()
+    {
+        return _matcher.TypeToInt<string>();
+    }
+
+    [Benchmark]
+    public int BenchmarkStruct()
+    {
+        return _matcher.TypeToInt<Struct>();
+    }
+
+    [Benchmark]
+    public int BenchmarkDouble()
+    {
+        return _matcher.TypeToInt<double>();
+    }
+
+    [Benchmark]
+    public int BenchmarkFloat()
+    {
+        return _matcher.TypeToInt<float>();
+    }
+
+    [Benchmark]
+    public int BenchmarkClass()
+    {
+        return _matcher.TypeToInt<Class>();
+    }
+
+    private class Matcher<T1>
+    {
+        public int TypeToInt<T>(T val = default!)
+        {
+            return val switch
+            {
+                int => 1,
+                string => 2,
+                double => 3,
+                T1 => 4,
+                Class => 5,
+                _ => 6
+            };
+        }
+    }
+
+    private struct Struct
+    {
+    }
+
+    private class Class
+    {
+    }
+}