Add benchmark support using -b

DayBenchmarker.cs

@@ -0,0 +1,23 @@
+using AdventOfCode.Days;
+using BenchmarkDotNet.Attributes;
+
+namespace AdventOfCode;
+
+[ShortRunJob]
+[MemoryDiagnoser(false)]
+public class DayBenchmark
+{
+    private Day Day => new Day15();
+
+    [Benchmark]
+    public void Part1()
+    {
+        Day.RunPart1(display: false);
+    }
+
+    [Benchmark]
+    public void Part2()
+    {
+        Day.RunPart2(display: false);
+    }
+}