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/mtproxy/faketls/server_hello_test.go

@@ -0,0 +1,57 @@
+package faketls
+
+import (
+	"bytes"
+	"encoding/hex"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Test_readServerHello(t *testing.T) {
+	p := filepath.Join("testdata", "server_hello")
+	entries, err := os.ReadDir(p)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	clientRandom := map[string][32]uint8{
+		"alexbers.hex": {
+			0xa1, 0x32, 0xe3, 0x91, 0x60, 0x83, 0xb3, 0x14, 0xc1, 0xb9, 0x74, 0xd0, 0x57, 0x85, 0xe8, 0xee,
+			0x70, 0x45, 0x6e, 0x5f, 0x86, 0x6d, 0x96, 0x57, 0xd5, 0x0a, 0x5c, 0x08, 0xea, 0x38, 0x31, 0x8e,
+		},
+		"mtgv2.hex": {
+			0xca, 0x36, 0xbb, 0xa8, 0x33, 0x80, 0x9a, 0x33, 0xaa, 0x62, 0x7e, 0xbb, 0x5a, 0x32, 0xa1, 0x01,
+			0x02, 0xd1, 0xa6, 0x1e, 0x1e, 0x6c, 0x58, 0xa4, 0x61, 0xd9, 0x34, 0x57, 0x4d, 0x2e, 0x2e, 0xa3,
+		},
+	}
+	secret := []uint8{
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+	}
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			t.Error("Unexpected directory in testdata")
+			continue
+		}
+		fileName := entry.Name()
+
+		t.Run(fileName, func(t *testing.T) {
+			a := require.New(t)
+
+			data, err := os.ReadFile(filepath.Join(p, fileName))
+			a.NoError(err)
+
+			decode, err := hex.DecodeString(strings.TrimSpace(string(data)))
+			a.NoError(err)
+
+			r := bytes.NewReader(decode)
+			a.NoError(readServerHello(r, clientRandom[entry.Name()], secret))
+
+			a.Zero(r.Len(), "should read all data")
+		})
+	}
+}