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/handle_updates.go

@@ -0,0 +1,47 @@
+package telegram
+
+import (
+	"fmt"
+
+	"github.com/go-faster/errors"
+	"go.uber.org/zap"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+func (c *Client) updateInterceptor(updates ...tg.UpdateClass) {
+	for _, update := range updates {
+		switch update.(type) {
+		case *tg.UpdateConfig, *tg.UpdateDCOptions:
+			c.fetchConfig(c.ctx)
+		}
+	}
+}
+
+func (c *Client) processUpdates(updates tg.UpdatesClass) error {
+	switch u := updates.(type) {
+	case *tg.Updates:
+		c.updateInterceptor(u.Updates...)
+		return c.updateHandler.Handle(c.ctx, u)
+	case *tg.UpdatesCombined:
+		c.updateInterceptor(u.Updates...)
+		return c.updateHandler.Handle(c.ctx, u)
+	case *tg.UpdateShort:
+		c.updateInterceptor(u.Update)
+		return c.updateHandler.Handle(c.ctx, u)
+	case *tg.UpdateShortMessage, *tg.UpdateShortChatMessage, *tg.UpdateShortSentMessage, *tg.UpdatesTooLong:
+		return c.updateHandler.Handle(c.ctx, u)
+	default:
+		c.log.Warn("Ignoring update", zap.String("update_type", fmt.Sprintf("%T", u)))
+	}
+	return nil
+}
+
+func (c *Client) handleUpdates(b *bin.Buffer) error {
+	updates, err := tg.DecodeUpdates(b)
+	if err != nil {
+		return errors.Wrap(err, "decode updates")
+	}
+	return c.processUpdates(updates)
+}