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/message/stickers.go

@@ -0,0 +1,69 @@
+package message
+
+import (
+	"context"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// UploadedSticker creates new UploadedStickerBuilder to create sticker attachment.
+func (u *UploadedDocumentBuilder) UploadedSticker() *UploadedStickerBuilder {
+	b := u
+	if u.doc.MimeType == "" {
+		b = u.MIME(DefaultStickerMIME)
+	}
+	return &UploadedStickerBuilder{
+		doc: b,
+		attr: tg.DocumentAttributeSticker{
+			Stickerset: &tg.InputStickerSetEmpty{},
+		},
+	}
+}
+
+// UploadedSticker adds uploaded sticker attachment.
+func UploadedSticker(file tg.InputFileClass, caption ...StyledTextOption) *UploadedStickerBuilder {
+	return UploadedDocument(file, caption...).UploadedSticker()
+}
+
+// UploadedStickerBuilder is a uploaded sticker media option.
+type UploadedStickerBuilder struct {
+	doc  *UploadedDocumentBuilder
+	attr tg.DocumentAttributeSticker
+}
+
+// Mask sets flag that is a mask sticker.
+func (u *UploadedStickerBuilder) Mask(mask bool) *UploadedStickerBuilder {
+	u.attr.Mask = mask
+	return u
+}
+
+// Alt sets alternative emoji representation of sticker.
+func (u *UploadedStickerBuilder) Alt(alt string) *UploadedStickerBuilder {
+	u.attr.Alt = alt
+	return u
+}
+
+// StickerSet sets associated sticker set.
+func (u *UploadedStickerBuilder) StickerSet(stickerSet tg.InputStickerSetClass) *UploadedStickerBuilder {
+	u.attr.Stickerset = stickerSet
+	return u
+}
+
+// MaskCoords sets mask coordinates (if this is a mask sticker, attached to a photo).
+func (u *UploadedStickerBuilder) MaskCoords(maskCoords tg.MaskCoords) *UploadedStickerBuilder {
+	u.attr.MaskCoords = maskCoords
+	return u
+}
+
+// apply implements MediaOption.
+func (u *UploadedStickerBuilder) apply(ctx context.Context, b *multiMediaBuilder) error {
+	return u.doc.Attributes(&u.attr).apply(ctx, b)
+}
+
+// UploadedSticker sends uploaded file as sticker.
+func (b *Builder) UploadedSticker(
+	ctx context.Context,
+	file tg.InputFileClass, caption ...StyledTextOption,
+) (tg.UpdatesClass, error) {
+	return b.Media(ctx, UploadedSticker(file, caption...))
+}