Add ChallengeTargetType

shared/src/commonMain/kotlin/org/hyperskill/app/challenges/domain/model/Challenge.kt

@@ -31,6 +31,9 @@ data class Challenge(
     @SerialName("current_interval")
     val currentInterval: Int?
 ) {
+    val targetType: ChallengeTargetType?
+        get() = ChallengeTargetType.getByValue(targetTypeValue)
+
     val status: ChallengeStatus?
         get() = ChallengeStatus.getByValue(statusValue)
 }

shared/src/commonMain/kotlin/org/hyperskill/app/challenges/domain/model/ChallengeStatus.kt

@@ -13,4 +13,4 @@ enum class ChallengeStatus(val value: String) {
         fun getByValue(value: String): ChallengeStatus? =
             VALUES.firstOrNull { it.value == value }
     }
-}
+}

shared/src/commonMain/kotlin/org/hyperskill/app/challenges/domain/model/ChallengeTargetType.kt

@@ -0,0 +1,18 @@
+package org.hyperskill.app.challenges.domain.model
+
+enum class ChallengeTargetType(val value: Int) {
+    TOPIC(2),
+    STEP(14),
+    PROJECT(29),
+    STAGE_ON_PRODUCTION(70),
+    STAGE_ON_RELEASE(71);
+    // Stage has different mapping on production and release
+    // https://vyahhi.myjetbrains.com/youtrack/issue/ALT-9537/Backend-Customisable-challenges#focus=Comments-74-265582.0-0
+
+    companion object {
+        private val VALUES: Array<ChallengeTargetType> = values()
+
+        fun getByValue(value: Int): ChallengeTargetType? =
+            VALUES.firstOrNull { it.value == value }
+    }
+}