Create integration support

[rajdip-b]

Description

We would like our users to receive notifications on their favorite application (Discord/Slack/etc.). Hence, we would like to dedicate considerable amount of time to this module.

Please note that this is a parent module. The PRs should be made to the submodules.

The idea here is the following:

• Set up a basic architecture to allow developing and adopting any sort of 3rd party application.
• Set up individual integrations on top of this architecture

Tasks

• Integration: Build the basic infrastructure #123
• Integration: Add Slack #124
• Integration: Add Discord #125

[rajdip-b]

Integration support