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/peers/bot.go

@@ -0,0 +1,48 @@
+package peers
+
+import (
+	"context"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// Bot is a bot User.
+type Bot struct {
+	User
+}
+
+// ChatHistory whether can the bot see all messages in groups.
+func (b Bot) ChatHistory() bool {
+	return b.raw.GetBotChatHistory()
+}
+
+// CanBeAdded whether can the bot be added to group.
+func (b Bot) CanBeAdded() bool {
+	return !b.raw.GetBotNochats()
+}
+
+// InlineGeo whether the bot can request our geolocation in inline mode.
+func (b Bot) InlineGeo() bool {
+	return b.raw.GetBotInlineGeo()
+}
+
+// InlinePlaceholder returns inline placeholder for this inline bot.
+func (b Bot) InlinePlaceholder() (string, bool) {
+	return b.raw.GetBotInlinePlaceholder()
+}
+
+// SupportsInline whether the bot supports inline queries.
+func (b Bot) SupportsInline() bool {
+	_, ok := b.InlinePlaceholder()
+	return ok
+}
+
+// BotInfo returns bot info.
+func (b Bot) BotInfo(ctx context.Context) (tg.BotInfo, error) {
+	full, err := b.m.getUserFull(ctx, b.InputUser())
+	if err != nil {
+		return tg.BotInfo{}, err
+	}
+
+	return full.BotInfo, nil
+}