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/rpc/engine_bench_test.go

@@ -0,0 +1,74 @@
+package rpc
+
+import (
+	"bytes"
+	"context"
+	"sync/atomic"
+	"testing"
+
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+)
+
+// mockObject implements bin.Object for testing.
+type mockObject struct {
+	data []byte
+}
+
+func (m mockObject) Decode(b *bin.Buffer) error {
+	if !bytes.Equal(b.Buf, m.data) {
+		return errors.New("mismatch")
+	}
+	b.Skip(len(b.Buf))
+	return nil
+}
+
+func (m mockObject) Encode(b *bin.Buffer) error {
+	b.Put(m.data)
+	return nil
+}
+
+func BenchmarkEngine_Do(b *testing.B) {
+	ids := make(chan int64, 100)
+	defer close(ids)
+
+	e := New(func(ctx context.Context, msgID int64, seqNo int32, in bin.Encoder) error {
+		ids <- msgID
+		return nil
+	}, Options{})
+
+	var id int64
+
+	ctx := context.Background()
+	b.ReportAllocs()
+	b.RunParallel(func(pb *testing.PB) {
+		go func() {
+			buf := &bin.Buffer{}
+			// Fake handler.
+			obj := mockObject{data: make([]byte, 100)}
+
+			for id := range ids {
+				e.NotifyAcks([]int64{id})
+
+				buf.ResetTo(obj.data)
+				if err := e.NotifyResult(id, buf); err != nil {
+					b.Error(err)
+				}
+			}
+		}()
+
+		obj := mockObject{data: make([]byte, 100)}
+
+		for pb.Next() {
+			nextID := atomic.AddInt64(&id, 1)
+			if err := e.Do(ctx, Request{
+				MsgID:  nextID,
+				Input:  obj,
+				Output: obj,
+			}); err != nil {
+				b.Fatal(err)
+			}
+		}
+	})
+}