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/cmd/dscidr/main.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"fmt"
+	"net/netip"
+	"os"
+
+	"gopkg.in/yaml.v3"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/dcs"
+)
+
+type CIDRElement struct {
+	CIDR string `json:"cidr" yaml:"cidr"`
+}
+
+type Ports struct {
+	Ports []Port `json:"ports" yaml:"ports"`
+}
+
+type Port struct {
+	Port string `json:"port" yaml:"port"`
+}
+
+type Element struct {
+	ToCIDRSet []CIDRElement `json:"toCIDRSet" yaml:"toCIDRSet"`
+	ToPorts   []Ports       `json:"toPorts" yaml:"toPorts"`
+}
+
+/*
+
+- toCIDRSet:
+   - cidr: 192.169.0.1/32
+  toPorts:
+   - ports:
+	   - port: "443"
+*/
+
+func main() {
+	list := dcs.Prod()
+	var out []CIDRElement
+	met := make(map[string]struct{})
+	for _, v := range list.Options {
+		ip, err := netip.ParseAddr(v.IPAddress)
+		if err != nil {
+			panic(err)
+		}
+		if v.Port != 443 {
+			panic("port != 443")
+		}
+		prefix := netip.PrefixFrom(ip, ip.BitLen())
+		cidr := prefix.String()
+		if _, ok := met[cidr]; ok {
+			continue
+		}
+		met[cidr] = struct{}{}
+		out = append(out, CIDRElement{CIDR: cidr})
+	}
+	fmt.Println("# telegram datacenters list")
+	fmt.Println("# generated by cmd/dcsidr")
+	e := yaml.NewEncoder(os.Stdout)
+	e.SetIndent(2)
+	if err := e.Encode(Element{
+		ToCIDRSet: out,
+		ToPorts: []Ports{
+			{
+				Ports: []Port{
+					{Port: "443"},
+				},
+			},
+		},
+	}); err != nil {
+		panic(err)
+	}
+}