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/tljson/convert_test.go

@@ -0,0 +1,67 @@
+package tljson
+
+import (
+	"testing"
+
+	"github.com/go-faster/jx"
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+func TestDecodeEncodeDecode(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   string
+		wantErr bool
+		expect  tg.JSONValueClass
+	}{
+		{"Empty", "", true, nil},
+		{"InvalidNull", "nul", true, nil},
+		{"InvalidTrue", "tru", true, nil},
+		{"InvalidFalse", "falsy", true, nil},
+		{"InvalidInt", `[1a]"`, true, nil},
+		{"InvalidFloat", "1.", true, nil},
+		{"InvalidString", `"hello`, true, nil},
+		{"InvalidArray", "[1, 2, 3.]", true, nil},
+		{"InvalidObject", `{"abc":"def}`, true, nil},
+
+		{"Null", "null", false, nil},
+		{"True", "true", false, nil},
+		{"False", "false", false, nil},
+		{"Int", "10", false, nil},
+		{"Float", "1.1", false, nil},
+		{"String", `"hello"`, false, nil},
+		{"EmptyArray", "[]", false, nil},
+		{"Array", "[1, 2, 3]", false, nil},
+		{"EmptyObject", `{}`, false, nil},
+		{"Object", `{"abc":"def"}`, false, nil},
+		{"Tree", `{"a":1,"b":true,"c":null,"sub":{"abc":"def"}}`, false, nil},
+	}
+	for _, tt := range tests {
+		tt := tt
+
+		t.Run(tt.name, func(t *testing.T) {
+			a := require.New(t)
+
+			// Decode.
+			d := jx.DecodeStr(tt.input)
+			obj, err := Decode(d)
+			if tt.wantErr {
+				a.Error(err)
+				return
+			}
+			a.NoError(err)
+
+			// Encode.
+			e := jx.GetEncoder()
+			Encode(obj, e)
+
+			// Decode.
+			d.ResetBytes(e.Bytes())
+			obj2, err := Decode(d)
+			a.NoError(err)
+			a.Equal(obj, obj2)
+		})
+	}
+}