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/peerid_map.go

@@ -0,0 +1,26 @@
+package peers
+
+import (
+	"go.mau.fi/mautrix-telegram/pkg/gotd/constant"
+)
+
+type peerIDSet struct {
+	m map[constant.TDLibPeerID]struct{}
+}
+
+func (p *peerIDSet) add(ids ...constant.TDLibPeerID) {
+	for _, id := range ids {
+		p.m[id] = struct{}{}
+	}
+}
+
+func (p *peerIDSet) delete(ids ...constant.TDLibPeerID) {
+	for _, id := range ids {
+		delete(p.m, id)
+	}
+}
+
+func (p *peerIDSet) has(id constant.TDLibPeerID) bool {
+	_, ok := p.m[id]
+	return ok
+}