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/peers/options.go

@@ -0,0 +1,40 @@
+package peers
+
+import (
+	"go.uber.org/zap"
+	"golang.org/x/sync/singleflight"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// Options is options of Manager
+type Options struct {
+	Storage Storage
+	Cache   Cache
+	Logger  *zap.Logger
+}
+
+func (o *Options) setDefaults() {
+	if o.Storage == nil {
+		o.Storage = &InmemoryStorage{}
+	}
+	if o.Cache == nil {
+		o.Cache = NoopCache{}
+	}
+	if o.Logger == nil {
+		o.Logger = zap.NewNop()
+	}
+}
+
+// Build creates new Manager.
+func (o Options) Build(api *tg.Client) *Manager {
+	o.setDefaults()
+	return &Manager{
+		api:     api,
+		storage: o.Storage,
+		cache:   o.Cache,
+		me:      new(atomicUser),
+		logger:  o.Logger,
+		sg:      singleflight.Group{},
+	}
+}