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/session/tdesktop/tdesktop_example_test.go

@@ -0,0 +1,28 @@
+package tdesktop_test
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/session/tdesktop"
+)
+
+func ExampleRead() {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		panic(err)
+	}
+
+	root := filepath.Join(home, "Downloads", "Telegram", "tdata")
+	accounts, err := tdesktop.Read(root, nil)
+	if err != nil {
+		panic(err)
+	}
+
+	for _, account := range accounts {
+		auth := account.Authorization
+		cfg := account.Config
+		fmt.Println(auth.UserID, auth.MainDC, cfg.Environment)
+	}
+}