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/telegram/auth/self_test.go

@@ -0,0 +1,42 @@
+package auth
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/testutil"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tgmock"
+)
+
+func TestClient_self(t *testing.T) {
+	ctx := context.Background()
+	mockTest(func(a *require.Assertions, mock *tgmock.Mock, client *Client) {
+		mock.ExpectCall(&tg.UsersGetUsersRequest{
+			ID: []tg.InputUserClass{&tg.InputUserSelf{}},
+		}).ThenErr(testutil.TestError())
+		_, err := client.self(ctx)
+		a.Error(err)
+
+		mock.ExpectCall(&tg.UsersGetUsersRequest{
+			ID: []tg.InputUserClass{&tg.InputUserSelf{}},
+		}).ThenResult(&tg.UserClassVector{Elems: []tg.UserClass{&tg.UserEmpty{
+			ID: 10,
+		}}})
+		_, err = client.self(ctx)
+		a.Error(err)
+
+		mock.ExpectCall(&tg.UsersGetUsersRequest{
+			ID: []tg.InputUserClass{&tg.InputUserSelf{}},
+		}).ThenResult(&tg.UserClassVector{Elems: []tg.UserClass{&tg.User{
+			Self:       true,
+			ID:         10,
+			AccessHash: 10,
+		}}})
+		r, err := client.self(ctx)
+		a.NoError(err)
+		a.Equal(int64(10), r.ID)
+	})(t)
+}