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/mtproto/write_test.go

@@ -0,0 +1,57 @@
+package mtproto
+
+import (
+	"context"
+	"crypto/rand"
+	"io"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap"
+
+	"github.com/gotd/neo"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/crypto"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/testutil"
+)
+
+func benchWrite(payloadSize int) func(b *testing.B) {
+	return func(b *testing.B) {
+		a := require.New(b)
+		logger := zap.NewNop()
+		random := rand.Reader
+		c := neo.NewTime(time.Now())
+
+		var key crypto.Key
+		_, err := io.ReadFull(random, key[:])
+		a.NoError(err)
+		authKey := key.WithID()
+
+		payload := make([]byte, payloadSize)
+		_, err = io.ReadFull(random, payload)
+		a.NoError(err)
+		data := &testPayload{Data: payload}
+
+		conn := Conn{
+			conn:              &constantConn{},
+			clock:             c,
+			rand:              random,
+			cipher:            crypto.NewClientCipher(random),
+			log:               logger,
+			authKey:           authKey,
+			compressThreshold: -1,
+		}
+		b.ResetTimer()
+		b.ReportAllocs()
+		b.SetBytes(int64(payloadSize))
+
+		for i := 0; i < b.N; i++ {
+			_ = conn.write(context.Background(), 1, 1, data)
+		}
+	}
+}
+
+func BenchmarkWrite(b *testing.B) {
+	testutil.RunPayloads(b, benchWrite)
+}