move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/telegram/query/dialogs/key.go

@@ -0,0 +1,66 @@
+package dialogs
+
+import (
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// PeerKind represents peer kind.
+type PeerKind int
+
+const (
+	// User is a private chat with user.
+	User PeerKind = iota
+	// Chat is a legacy chat.
+	Chat
+	// Channel is a supergroup/channel.
+	Channel
+)
+
+// DialogKey is a generic peer key.
+type DialogKey struct {
+	Kind       PeerKind
+	ID         int64
+	AccessHash int64
+}
+
+// FromInputPeer fills key using given peer.
+func (d *DialogKey) FromInputPeer(peer tg.InputPeerClass) error {
+	switch v := peer.(type) {
+	case *tg.InputPeerUser:
+		d.Kind = User
+		d.ID = v.UserID
+		d.AccessHash = v.AccessHash
+	case *tg.InputPeerChat:
+		d.Kind = Chat
+		d.ID = v.ChatID
+	case *tg.InputPeerChannel:
+		d.Kind = Channel
+		d.ID = v.ChannelID
+		d.AccessHash = v.AccessHash
+	default:
+		return errors.Errorf("unexpected type %T", peer)
+	}
+
+	return nil
+}
+
+// FromPeer fills key using given peer.
+func (d *DialogKey) FromPeer(peer tg.PeerClass) error {
+	switch v := peer.(type) {
+	case *tg.PeerUser:
+		d.Kind = User
+		d.ID = v.UserID
+	case *tg.PeerChat:
+		d.Kind = Chat
+		d.ID = v.ChatID
+	case *tg.PeerChannel:
+		d.Kind = Channel
+		d.ID = v.ChannelID
+	default:
+		return errors.Errorf("unexpected type %T", peer)
+	}
+
+	return nil
+}