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/dcs/list.go

@@ -0,0 +1,15 @@
+package dcs
+
+import "go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+
+// List is a list of Telegram DC addresses and domains.
+type List struct {
+	Options []tg.DCOption
+	Domains map[int]string
+	Test    bool
+}
+
+// Zero returns true if this List is zero value.
+func (d List) Zero() bool {
+	return d.Options == nil && d.Domains == nil && !d.Test
+}