Add MetaAI (@bot) send/receive messages capability

[vphelipe]

What this PR does
Adds capability to send messages to MetaAI (@bot) via Baileys
Implements message decryption from @bot addresses

To send messages:
sock.sendMessage("867051314767696@bot", { text: 'Hi meta ai!' });

Important: getMessage must be configured in the socket for proper decryption of MetaAI and @bot messages.

Message sending ✅
Message receiving and decryption ✅

🇧🇷

[whiskeysockets-bot]

Thanks for your contribution.

The next step is to wait for review and approval to merge it to main repository

The community can help reacting with a thumb up (:thumbsup:) for approval and rocket (:rocket:) for who has tested it.

To test this PR you can run the following command below:

# NPM
npm install @whiskeysockets/baileys@vphelipe/Baileysbsb#master
# YARN v2
yarn add @whiskeysockets/baileys@vphelipe/Baileysbsb#master

[Skidy89]

this is good, but in whatsapp bussiness @bot is still a normal jid or sometimes a @c.us user

[Akkun3704]

Has anyone tried it? is it work?

[alequizao]

👍 👍 👍

[purpshell]

1. Remove the jid map
2. add Usync protocol support (to get bot info)
3. add a store for message secrets (hard until Storage format is released)
4. type formatting, linting
5. Eliminate the need for @s.whatsapp.net entirely (whatsapp bots do not need that)