feat: add .chatid variable in file name template

common/utils/tgutil/peer.go

@@ -0,0 +1,16 @@
+package tgutil
+
+import "github.com/gotd/td/tg"
+
+func ChatIdFromPeer(peer tg.PeerClass) int64 {
+	switch peer := peer.(type) {
+	case *tg.PeerChannel:
+		return peer.ChannelID
+	case *tg.PeerUser:
+		return peer.UserID
+	case *tg.PeerChat:
+		return peer.ChatID
+	default:
+		return 0
+	}
+}