[Feature] Add Streaming to Telegram Bots

[LaDoger]

I'd like to add streaming (a.k.a. typing animation) to Telegram Bots as well.

So I've reviewed the code. Looks like we'll have to:

• In app/client/platforms/telegram.ts
  • In TelegramAPI, apart from the sendMessage() function, we should add an editMessage() function.
  • We should modify the sendMessage() function to (at least) return the message id.
• In app/store/session.ts
  • Somewhere in callSession(), we might have to add something like stream: true to enable streaming chunks. See this.
• In app/workers/telegram.ts
  • In handleAI()
  • We might have to add something like stream: true somewhere as well.
  • In handleUpdate(), in if (aiMessage)
  • With streaming enabled, the bot should have to reply right after it received the first chunk of response.
  • After sending the message, we should store the message id of the sent message in a constant.
  • We should also store the current full message text in a variable.
  • Then, as we receive more chunks, the bot should constantly edit the message so it gets longer and longer.

[marcusschiesser]

@LaDoger looks like a proper analysis. Should be done after https://github.com/marcusschiesser/unc/issues/14 due to it's dependency with session.ts