feat:支持在等待时取消获取锁

src/FreeRedis/RedisClient/Modules/Lock.cs

@@ -57,7 +57,7 @@ public LockController Lock(string name, int timeoutSeconds, int refrshTimeoutSec
 				{
 					return new LockController(this, name, value, timeoutSeconds, refrshTimeoutSeconds, autoDelay, token);
 				}
-
+				if (token.IsCancellationRequested) return null;
 				Thread.CurrentThread.Join(millisecondsTimeout: 3);
 			}
 			return null;