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/message/peer_unpack_test.go

@@ -0,0 +1,35 @@
+package message
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+func TestUnpack(t *testing.T) {
+	ctx := context.Background()
+	sender, _ := testSender(t)
+
+	var p tg.InputPeerClass = &tg.InputPeerUser{
+		UserID:     10,
+		AccessHash: 10,
+	}
+	_, err := sender.To(p).AsInputChannel(ctx)
+	require.Error(t, err)
+
+	_, err = sender.To(p).AsInputUser(ctx)
+	require.NoError(t, err)
+
+	p = &tg.InputPeerChannel{
+		ChannelID:  10,
+		AccessHash: 10,
+	}
+	_, err = sender.To(p).AsInputChannel(ctx)
+	require.NoError(t, err)
+
+	_, err = sender.To(p).AsInputUser(ctx)
+	require.Error(t, err)
+}