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/tdsync/log_group.go

@@ -0,0 +1,68 @@
+package tdsync
+
+import (
+	"context"
+
+	"github.com/go-faster/errors"
+	"go.uber.org/zap"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/clock"
+)
+
+// LogGroup is simple wrapper around CancellableGroup to log task state.
+// Unlike WaitGroup and errgroup.Group this is not allowed to use zero value.
+type LogGroup struct {
+	group CancellableGroup
+
+	log   *zap.Logger
+	clock clock.Clock
+}
+
+// NewLogGroup creates new LogGroup.
+func NewLogGroup(parent context.Context, log *zap.Logger) *LogGroup {
+	return &LogGroup{
+		group: *NewCancellableGroup(parent),
+		log:   log,
+		clock: clock.System,
+	}
+}
+
+// SetClock sets Clock to use.
+func (g *LogGroup) SetClock(c clock.Clock) {
+	g.clock = c
+}
+
+// Go calls the given function in a new goroutine.
+//
+// The first call to return a non-nil error cancels the group; its error will be
+// returned by Wait.
+func (g *LogGroup) Go(taskName string, f func(groupCtx context.Context) error) {
+	g.group.Go(func(ctx context.Context) error {
+		start := g.clock.Now()
+		l := g.log.With(zap.String("task", taskName)).WithOptions(zap.AddCallerSkip(1))
+		l.Debug("Task started")
+
+		if err := f(ctx); err != nil {
+			elapsed := g.clock.Now().Sub(start)
+			l.Debug("Task stopped", zap.Error(err), zap.Duration("elapsed", elapsed))
+			return errors.Wrapf(err, "task %s", taskName)
+		}
+
+		elapsed := g.clock.Now().Sub(start)
+		l.Debug("Task complete", zap.Duration("elapsed", elapsed))
+		return nil
+	})
+}
+
+// Cancel cancels all goroutines in group.
+//
+// Note: context cancellation error will be returned by Wait().
+func (g *LogGroup) Cancel() {
+	g.group.Cancel()
+}
+
+// Wait blocks until all function calls from the Go method have returned, then
+// returns the first non-nil error (if any) from them.
+func (g *LogGroup) Wait() error {
+	return g.group.Wait()
+}