Add Bot API 10.2 Bot Subscriptions support example

New BotSubscriptionsBot demonstrating the 36.0.0 subscription-updates API:
- onBotSubscriptionUpdated trigger reading user / invoicePayload / state
- exhaustive handling of the typed BotSubscriptionUpdated.State sealed type
  (Active / Canceled / Failed data objects + Unknown value-class fallback)
- botSubscriptionUpdatedUpdatesFlow raw update flow
- waitBotSubscriptionUpdated expectation

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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2026-07-19 17:23:43 +06:00
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# BotSubscriptionsBot
Demonstrates Bot Subscriptions (subscription updates) support introduced in Telegram Bot API 10.2.
The bot logs and reacts to `subscription` updates — when a user's recurring Telegram Stars subscription to
the bot becomes active, is canceled, or fails — handling the typed `BotSubscriptionUpdated.State`.
## Launch
```bash
../gradlew :BotSubscriptionsBot:run --args="BOT_TOKEN"
```