add support to Microsoft Teams

[kaiomagalhaes]

We need to replicate the functionality that we have for Slack but using Microsoft Teams.

Our goal is to allow this project to send notifications to the Microsoft Teams application. We need to:

• Setup an authentication system when creating a Microsoft teams App .
• add a logic that we'll use the ProviderCredential to define which one of the clients to use. That means adding a new field there called service_type that can be either slack or teams
• Send channel messages to Teams
• Send direct messages to Teams

While working on this feature we need to create controller tests for it.

Possible resources:
https://www.skcript.com/svr/microsoft-teams-bot-with-ruby-on-rails-and-rest-api/
https://github.com/oooooooo/msteams-ruby-client