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/fileid/rle_test.go

@@ -0,0 +1,50 @@
+package fileid
+
+import (
+	"encoding/base64"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Test_rleEncode(t *testing.T) {
+	for name, input := range testData {
+		t.Run(name, func(t *testing.T) {
+			a := require.New(t)
+			original, err := base64Decode(input)
+			a.NoError(err)
+
+			decoded := rleDecode(original)
+			a.Equal(original, rleEncode(decoded))
+		})
+	}
+}
+
+func Test_rleDecode(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		want  []byte
+	}{
+		{
+			"Valid",
+			testData["Sticker"],
+			[]uint8{
+				0x08, 0x00, 0x00, 0x02, 0x02, 0x00, 0x00, 0x00, 0x19, 0x01, 0x00, 0x00, 0x00, 0x3a, 0x61, 0x99,
+				0x43, 0x10, 0x70, 0xa6, 0x69, 0x32, 0xab, 0x52, 0x10, 0x88, 0x8f, 0x10, 0x0f, 0xb4, 0xfb, 0x63,
+				0x57, 0x1e, 0x00, 0x00, 0x27, 0x00, 0x00, 0x00, 0x87, 0x57, 0x8f, 0x1e, 0x9d, 0x18, 0xbc, 0x87,
+				0xc1, 0x75, 0x4d, 0x70, 0x22, 0x04,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			a := require.New(t)
+			decoded, err := base64.URLEncoding.DecodeString(tt.input)
+			a.NoError(err)
+
+			a.Equal(tt.want, rleDecode(decoded))
+		})
+	}
+}