Add enums for the custom analytics fields

app/Models/Enums/AnalyticsDimensions.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Models\Enums;
+
+/**
+ * Class AnalyticsDimensions
+ * @package App\Models\Enums
+ */
+class AnalyticsDimensions
+{
+    const PHP_VERSION = 1;
+    const MYSQL_VERSION = 2;
+    const PHPVMS_VERSION = 3;
+}

app/Models/Enums/AnalyticsMetrics.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Models\Enums;
+
+/**
+ * Class AnalyticsMetrics
+ * @package App\Models\Enums
+ */
+class AnalyticsMetrics
+{
+    # Track the lookup time for airports from vaCentral
+    const AIRPORT_LOOKUP_TIME = 1;
+}