app center；增加發送ping的秒

Assets/AppCenter/Plugins/AppCenterSDK/Analytics/Shared/Flags.cs

@@ -0,0 +1,24 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+using System;
+
+namespace Microsoft.AppCenter.Unity.Analytics
+{
+    /// <summary>
+    /// Persistence and latency flags for telemetry.
+    /// </summary>
+    [Flags]
+    public enum Flags
+    {
+        /// <summary>
+        /// An event can be lost due to low bandwidth or disk space constraints.
+        /// </summary>
+        PersistenceNormal = 0x01,
+
+        /// <summary>
+        /// Used for events that should be prioritized over non-critical events.
+        /// </summary>
+        PersistenceCritical = 0x02
+    }
+}