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/cdn_test.go

@@ -0,0 +1,43 @@
+package telegram
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+func Test_parseCDNKeys(t *testing.T) {
+	keys := []string{
+		`-----BEGIN RSA PUBLIC KEY-----
+MIIBCgKCAQEA+Lf3PvgE1yxbJUCMaEAk
+V0QySTVpnaDjiednB5RbtNWjCeqSVakYHbqqGMIIv5WCGdFdrqOfMNcNSstPtSU6
+R9UmRw6tquOIykpSuUOje9H+4XVIKqujyL2ISdK+4ZOMl4hCMkqauw4bP1Sbr03v
+ZRQbU6qEA04V4j879BAyBVhr3WG9+Zi+t5XfGSTgSExPYEl8rZNHYNV5RB+BuroV
+H2HLTOpT/mJVfikYpgjfWF5ldezV4Wo9LSH0cZGSFIaeJl8d0A8Eiy5B9gtBO8mL
++XfQRKOOmr7a4BM4Ro2de5rr2i2od7hYXd3DO9FRSl4y1zA8Am48Rfd95WHF3N/O
+mQIDAQAB
+-----END RSA PUBLIC KEY-----`,
+		`-----BEGIN RSA PUBLIC KEY-----
+MIIBCgKCAQEAyu5PXyfp+VFLc2hKJsq/cvQ+wq9V2s1iGMMwcrkXrKAqX0S5QEcY
+W9b6pV5LulbsvNcxp/YniiSL4FsAja28B9fH//Y+AolWASomCB0NSVHwS1Pqfe3m
+GdLTwDmqU17tSWk/48+Kfn4B+WT85ZIKt8bOnABwnM1AtykX0zKwzm9yKcTX0MeY
+rwzgiOQax6J1cfgtLdxl8HVKT6wCOS1e43zpXMU+UoWqRqIan+J6q+ubi1yF4PWl
+DyDgJSw8uxlhNNMP4tAnshIRZ1ZZ25O/g58jw1qz5XMztZwLNA2pUxaFtyy1LdHC
+FRX7DdwIA/FdOzfWyXYLlCFaSX8K/6CnSQIDAQAB
+-----END RSA PUBLIC KEY-----`,
+	}
+
+	cdnKeys := make([]tg.CDNPublicKey, 0, len(keys))
+	for i, key := range keys {
+		cdnKeys = append(cdnKeys, tg.CDNPublicKey{
+			DCID:      i + 1,
+			PublicKey: key,
+		})
+	}
+
+	publicKeys, err := parseCDNKeys(cdnKeys...)
+	require.NoError(t, err)
+	require.Len(t, publicKeys, 2)
+}