[AI-FSSDK] [FSSDK-12337] Add experiment type constants to Experiment entity

Author: FarhanAnjum-opti

OptimizelySDK/Config/DatafileProjectConfig.cs

@@ -462,7 +462,7 @@ private void Initialize()
                     }
 
                     var experiment = _ExperimentIdMap[experimentId];
-                    if (experiment.Type != "fr")
+                    if (experiment.Type != Experiment.ExperimentTypeFr)
                     {
                         continue;
                     }

OptimizelySDK/Entity/Experiment.cs

@@ -23,6 +23,12 @@ public class Experiment : ExperimentCore
     {
         private const string MUTEX_GROUP_POLICY = "random";
 
+        public const string ExperimentTypeAb = "ab";
+        public const string ExperimentTypeMab = "mab";
+        public const string ExperimentTypeCmab = "cmab";
+        public const string ExperimentTypeTd = "td";
+        public const string ExperimentTypeFr = "fr";
+
         /// <summary>
         /// Group ID for the experiment
         /// </summary>
@@ -50,7 +56,7 @@ public class Experiment : ExperimentCore
             !string.IsNullOrEmpty(GroupPolicy) && GroupPolicy == MUTEX_GROUP_POLICY;
 
         /// <summary>
-        /// Type of the experiment (e.g., "a/b", "feature_rollout", "targeted_delivery", etc.)
+        /// Type of the experiment (e.g., "ab", "fr", "td", etc.)
         /// Optional - old datafiles will not have this field.
         /// </summary>
         [JsonProperty("type")]