Add CompositeComponent benchmark

Add a benchmark for `CompositeComponent` to aid with #1732.

bench/BenchmarkDotNet.Artifacts/results/Polly.Core.Benchmarks.CompositeComponentBenchmark-report-github.md

@@ -0,0 +1,14 @@
+```
+
+BenchmarkDotNet v0.13.9+228a464e8be6c580ad9408e98f18813f6407fb5a, Windows 11 (10.0.22621.2428/22H2/2022Update/SunValley2)
+12th Gen Intel Core i7-1270P, 1 CPU, 16 logical and 12 physical cores
+.NET SDK 7.0.403
+  [Host] : .NET 7.0.13 (7.0.1323.51816), X64 RyuJIT AVX2
+
+Job=MediumRun  Toolchain=InProcessEmitToolchain  IterationCount=15  
+LaunchCount=2  WarmupCount=10  
+
+```
+| Method                         | Mean     | Error    | StdDev   | Allocated |
+|------------------------------- |---------:|---------:|---------:|----------:|
+| CompositeComponent_ExecuteCore | 44.37 ns | 1.994 ns | 2.923 ns |         - |

bench/Polly.Core.Benchmarks/CompositeComponentBenchmark.cs

@@ -0,0 +1,27 @@
+using Polly.Telemetry;
+using Polly.Utils.Pipeline;
+
+namespace Polly.Core.Benchmarks;
+
+public class CompositeComponentBenchmark
+{
+    private ResilienceContext? _context;
+    private PipelineComponent? _component;
+
+    [GlobalSetup]
+    public void Setup()
+    {
+        var first = PipelineComponent.Empty;
+        var second = PipelineComponent.Empty;
+        var source = new ResilienceTelemetrySource("pipeline", "instance", "strategy");
+        var telemetry = new ResilienceStrategyTelemetry(source, null);
+        var components = new[] { first, second };
+
+        _component = CompositeComponent.Create(components, telemetry, TimeProvider.System);
+        _context = ResilienceContextPool.Shared.Get();
+    }
+
+    [Benchmark]
+    public ValueTask<Outcome<int>> CompositeComponent_ExecuteCore()
+        => _component!.ExecuteCore((_, state) => Outcome.FromResultAsValueTask(state), _context!, 42);
+}