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/multi.go

@@ -0,0 +1,95 @@
+package message
+
+import (
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+func convertMessageMediaToInput(m tg.MessageMediaClass) (tg.InputMediaClass, error) {
+	switch v := m.(type) {
+	case *tg.MessageMediaPhoto: // messageMediaPhoto#695150d7
+		photo, ok := v.Photo.AsNotEmpty()
+		if !ok {
+			return nil, errors.Errorf("unexpected type %T", v.Photo)
+		}
+
+		return &tg.InputMediaPhoto{
+			ID:         photo.AsInput(),
+			TTLSeconds: v.TTLSeconds,
+		}, nil
+	case *tg.MessageMediaGeo: // messageMediaGeo#56e0d474
+		geo, ok := v.Geo.AsNotEmpty()
+		if !ok {
+			return nil, errors.Errorf("unexpected type %T", v.Geo)
+		}
+
+		r := new(tg.InputGeoPoint)
+		r.FillFrom(geo)
+		return &tg.InputMediaGeoPoint{
+			GeoPoint: r,
+		}, nil
+	case *tg.MessageMediaContact: // messageMediaContact#cbf24940
+		r := new(tg.InputMediaContact)
+		r.FillFrom(v)
+		return r, nil
+	case *tg.MessageMediaDocument: // messageMediaDocument#9cb070d7
+		document, ok := v.Document.AsNotEmpty()
+		if !ok {
+			return nil, errors.Errorf("unexpected type %T", v.Document)
+		}
+
+		return &tg.InputMediaDocument{
+			ID:         document.AsInput(),
+			TTLSeconds: v.TTLSeconds,
+		}, nil
+	case *tg.MessageMediaVenue: // messageMediaVenue#2ec0533f
+		geo, ok := v.Geo.AsNotEmpty()
+		if !ok {
+			return nil, errors.Errorf("unexpected type %T", v.Geo)
+		}
+
+		r := new(tg.InputGeoPoint)
+		r.FillFrom(geo)
+		return &tg.InputMediaVenue{
+			GeoPoint:  r,
+			Title:     v.Title,
+			Address:   v.Address,
+			Provider:  v.Provider,
+			VenueID:   v.VenueID,
+			VenueType: v.VenueType,
+		}, nil
+	case *tg.MessageMediaGame: // messageMediaGame#fdb19008
+		r := new(tg.InputGameID)
+		r.FillFrom(&v.Game)
+
+		return &tg.InputMediaGame{
+			ID: r,
+		}, nil
+	case *tg.MessageMediaGeoLive: // messageMediaGeoLive#b940c666
+		geo, ok := v.Geo.AsNotEmpty()
+		if !ok {
+			return nil, errors.Errorf("unexpected type %T", v.Geo)
+		}
+
+		r := new(tg.InputGeoPoint)
+		r.FillFrom(geo)
+		return &tg.InputMediaGeoLive{
+			GeoPoint:                    r,
+			Heading:                     v.Heading,
+			Period:                      v.Period,
+			ProximityNotificationRadius: v.ProximityNotificationRadius,
+		}, nil
+	case *tg.MessageMediaDice: // messageMediaDice#3f7ee58b
+		r := new(tg.InputMediaDice)
+		r.FillFrom(v)
+		return r, nil
+	default:
+		// messageMediaPoll#4bd6e798
+		// messageMediaWebPage#a32dd600
+		// messageMediaEmpty#3ded6320
+		// messageMediaUnsupported#9f84f49e
+		// messageMediaInvoice#84551347
+		return nil, errors.Errorf("unexpected type %T", v)
+	}
+}