Expose UTF-8 feedback commands and full message identities on Android

tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt

@@ -97,6 +97,7 @@ object NativeLib {
     fun connectMemberNode(channelId: String, nodeId: Long) { nativeConnectMemberNode(channelId, nodeId) }
     fun getChannels(): String = nativeGetChannels() ?: "[]"
     fun getMessages(channelId: String, limit: Int = 50): String = nativeGetMessages(channelId, limit) ?: "[]"
+    fun feedbackCommand(json: String, requestId: Long = 0): Boolean = nativeFeedbackCommand(json.toByteArray(Charsets.UTF_8), requestId)
     fun clearDatabase(): Boolean = nativeClearDatabase()
     fun setDebugLevel(category: String, level: String) { nativeSetDebugLevel(category, level) }
 
@@ -237,6 +238,7 @@ object NativeLib {
     private external fun nativeConnectMemberNode(channelId: String, nodeId: Long)
     private external fun nativeGetChannels(): String?
     private external fun nativeGetMessages(channelId: String, limit: Int): String?
+    private external fun nativeFeedbackCommand(json: ByteArray, requestId: Long): Boolean
     private external fun nativeSetDebugLevel(category: String, level: String)
     private external fun nativeSetChatSetting(name: String, value: String)
     private external fun nativeGetChatSettingInt(name: String, def: Int): Int