Decouple API call logic for different providers

[mmikirtumov]

What we want to Achieve

We are going to scale our architecture and allow multiple providers to connect to our system (now only slack).

Multiple API providers

Create infrastructure which will allow other contributors add new API providers (.Net Core Projects)

How to achieve

Separate API calling logic into independant build project which will allow create new api integration with other bots

Links: https://stackoverflow.com/questions/22493707/how-to-configure-web-api-2-to-look-for-controllers-in-a-separate-project-just
https://stackoverflow.com/questions/47617994/how-to-use-a-controller-in-another-assembly-in-asp-net-core-mvc-2-0?rq=1