Add GPU lease warm-up and shared limiter

PerfectNumbers.Core/Gpu/GpuPrimeLeaseLimiter.cs

@@ -0,0 +1,37 @@
+using System.Threading;
+
+namespace PerfectNumbers.Core.Gpu;
+
+public static class GpuPrimeLeaseLimiter
+{
+        private static SemaphoreSlim _semaphore = new(int.MaxValue, int.MaxValue);
+        private static int _currentLimit = int.MaxValue;
+
+        public static void Initialize(int limit)
+        {
+                if (limit <= 0)
+                {
+                        limit = 1;
+                }
+
+                if (limit == _currentLimit)
+                {
+                        return;
+                }
+
+                var previous = _semaphore;
+                _semaphore = new SemaphoreSlim(limit, limit);
+                _currentLimit = limit;
+                previous.Dispose();
+        }
+
+        public static void Enter()
+        {
+                _semaphore.Wait();
+        }
+
+        public static void Exit()
+        {
+                _semaphore.Release();
+        }
+}