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/bin/encode_bench_test.go

@@ -0,0 +1,56 @@
+package bin_test
+
+import (
+	"testing"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/message/entity"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/message/styling"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+func BenchmarkDecodeSlice(b *testing.B) {
+	builder := entity.Builder{}
+	if err := styling.Perform(&builder,
+		styling.Plain("plaintext"), styling.Plain("\n\n"),
+		styling.Mention("@durov"), styling.Plain("\n\n"),
+		styling.Hashtag("#hashtag"), styling.Plain("\n\n"),
+		styling.BotCommand("/command"), styling.Plain("\n\n"),
+		styling.URL("https://google.org"), styling.Plain("\n\n"),
+		styling.Email("example@example.org"), styling.Plain("\n\n"),
+		styling.Bold("bold"), styling.Plain("\n\n"),
+		styling.Italic("italic"), styling.Plain("\n\n"),
+		styling.Underline("underline"), styling.Plain("\n\n"),
+		styling.Strike("strike"), styling.Plain("\n\n"),
+		styling.Code("fmt.Println(`Hello, World!`)"), styling.Plain("\n\n"),
+		styling.Pre("fmt.Println(`Hello, World!`)", "Go"), styling.Plain("\n\n"),
+		styling.TextURL("clickme", "https://google.com"), styling.Plain("\n\n"),
+		styling.Phone("+71234567891"), styling.Plain("\n\n"),
+		styling.Cashtag("$CASHTAG"), styling.Plain("\n\n"),
+		styling.Blockquote("blockquote", false), styling.Plain("\n\n"),
+		styling.BankCard("5550111111111111"), styling.Plain("\n\n"),
+	); err != nil {
+		b.Fatal(err)
+	}
+	message, entities := builder.Complete()
+
+	var buf bin.Buffer
+	if err := buf.Encode(&tg.Message{
+		PeerID:   &tg.PeerUser{},
+		Message:  message,
+		Entities: entities,
+	}); err != nil {
+		b.Fatal(err)
+	}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		var msg tg.Message
+
+		if err := msg.Decode(&bin.Buffer{Buf: buf.Buf}); err != nil {
+			b.Fatal(err)
+		}
+	}
+}