messenger pre-release

• Initial release for messenger
• Implemented a central notification system that's main purpose is to just deliver messages for all the other umbrella services for CryptoBOT.
• Platform, Language and Service agnostic as it pulls messages from RabbitMQ and pushes to users on different platforms.
• Release before MVP.

What's Changed

• init: queue consumer by @kautilyak in #1
• MERGE TO MAIN by @kautilyak in #3

New Contributors

• @kautilyak made their first contribution in #1

Full Changelog: https://github.com/CryptoAlertsBOT/messenger/commits/1.0