fix gcir (#281)

StatsigUser object cannot be properly serialize with one of the most
common java json library.
Decide to return a map copy of statsigUser instead of the whole object. 

Atlassian runs into stackoverflow problem when it tries to
serialize/deserialize see context:
https://statsigconnect.slack.com/archives/C04DH1ZBXLL/p1716874184576309

Author: xinlili-statsig

src/main/kotlin/com/statsig/sdk/ClientInitializeFormatter.kt

@@ -11,7 +11,7 @@ internal data class ClientInitializeResponse(
     @SerializedName("time") var time: Long,
     @SerializedName("evaluated_keys") var evaluated_keys: Map<String, Any>,
     @SerializedName("hash_used") var hash_used: String,
-    @SerializedName("user") var user: StatsigUser,
+    @SerializedName("user") var user: Map<String, Any?>,
     @SerializedName("sdkInfo") var sdkInfo: Map<String, String>,
 ) {
 
@@ -25,7 +25,7 @@ internal data class ClientInitializeResponse(
         map["time"] = time
         map["evaluated_keys"] = evaluated_keys
         map["hash_used"] = hash_used
-        map["user"] = user
+        map["user"] = user.toMap()
         map["sdkInfo"] = sdkInfo
         return map
     }
@@ -126,7 +126,7 @@ internal class ClientInitializeFormatter(
             specStore.getLastUpdateTime(),
             evaluatedKeys,
             this.hash.toString().lowercase(),
-            user,
+            user.toMap(),
             mutableMapOf<String, String>().apply {
                 this["sdkType"] = metadata.sdkType
                 this["sdkVersion"] = metadata.sdkVersion

src/main/kotlin/com/statsig/sdk/StatsigUser.kt

@@ -151,4 +151,20 @@ data class StatsigUser private constructor(
 
         return sb.toString()
     }
+
+    fun toMap(): Map<String, Any?> {
+        return mapOf(
+            "userID" to userID,
+            "userAgent" to userAgent,
+            "appVersion" to appVersion,
+            "country" to country,
+            "custom" to custom,
+            "customIDs" to customIDs,
+            "email" to email,
+            "ip" to ip,
+            "locale" to locale,
+            "statsigEnvironment" to statsigEnvironment,
+            "privateAttributes" to privateAttributes,
+        )
+    }
 }