fix use user in group messages

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/GroupMessages.kt

@@ -38,6 +38,7 @@ data class AnonymousGroupMessageImpl<T : MessageContent>(
 data class CommonGroupMessageImpl<T : MessageContent>(
     override val chat: GroupChat,
     override val messageId: MessageIdentifier,
+    override val user: User,
     override val date: DateTime,
     override val forwardInfo: ForwardInfo?,
     override val editDate: DateTime?,

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/RawMessage.kt

@@ -296,6 +296,7 @@ internal data class RawMessage(
                             null -> CommonGroupMessageImpl(
                                 chat,
                                 messageId,
+                                from ?: error("It is expected that in messages from non anonymous users and channels user must be specified"),
                                 date.asDate,
                                 forwarded,
                                 edit_date ?.asDate,

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/abstracts/GroupMessages.kt

@@ -17,4 +17,4 @@ interface AnonymousGroupMessage<T : MessageContent> : GroupMessage<T>, SignedMes
     override val senderChat: GroupChat
         get() = chat
 }
-interface CommonGroupMessage<T : MessageContent> : GroupMessage<T>
+interface CommonGroupMessage<T : MessageContent> : GroupMessage<T>, FromUserMessage