Add migration config screen to select and prioritize target sources (#2144)

core/common/src/main/kotlin/tachiyomi/core/common/preference/PreferenceStore.kt

@@ -24,6 +24,18 @@ interface PreferenceStore {
     fun getAll(): Map<String, *>
 }
 
+fun PreferenceStore.getLongArray(
+    key: String,
+    defaultValue: List<Long>,
+): Preference<List<Long>> {
+    return getObject(
+        key = key,
+        defaultValue = defaultValue,
+        serializer = { it.joinToString(",") },
+        deserializer = { it.split(",").mapNotNull { l -> l.toLongOrNull() } },
+    )
+}
+
 inline fun <reified T : Enum<T>> PreferenceStore.getEnum(
     key: String,
     defaultValue: T,