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/forward.go

@@ -0,0 +1,70 @@
+package message
+
+import (
+	"context"
+
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// ForwardBuilder is a forward request builder.
+type ForwardBuilder struct {
+	builder     *Builder
+	from        tg.InputPeerClass
+	ids         []int
+	withMyScore bool
+}
+
+// WithMyScore sets flag to include your score in the forwarded game.
+func (b *ForwardBuilder) WithMyScore() *ForwardBuilder {
+	b.withMyScore = true
+	return b
+}
+
+// Send sends forwarded messages.
+func (b *ForwardBuilder) Send(ctx context.Context) (tg.UpdatesClass, error) {
+	p, err := b.builder.peer(ctx)
+	if err != nil {
+		return nil, errors.Wrap(err, "peer")
+	}
+
+	upd, err := b.builder.sender.forwardMessages(ctx, &tg.MessagesForwardMessagesRequest{
+		Silent:       b.builder.silent,
+		Background:   b.builder.background,
+		WithMyScore:  b.withMyScore,
+		FromPeer:     b.from,
+		ID:           b.ids,
+		ToPeer:       p,
+		ScheduleDate: b.builder.scheduleDate,
+	})
+	if err != nil {
+		return nil, errors.Wrap(err, "send inline bot result")
+	}
+
+	return upd, nil
+}
+
+// ForwardIDs creates builder to forward messages by ID.
+func (b *Builder) ForwardIDs(from tg.InputPeerClass, id int, ids ...int) *ForwardBuilder {
+	return &ForwardBuilder{
+		builder: b,
+		from:    from,
+		ids:     append([]int{id}, ids...),
+	}
+}
+
+// ForwardMessages creates builder to forward messages.
+func (b *Builder) ForwardMessages(from tg.InputPeerClass, msg tg.MessageClass, m ...tg.MessageClass) *ForwardBuilder {
+	r := make([]int, 1+len(m))
+	r[0] = msg.GetID()
+	for i := range m {
+		r[i+1] = m[i].GetID()
+	}
+
+	return &ForwardBuilder{
+		builder: b,
+		from:    from,
+		ids:     r,
+	}
+}