Multiplex Merge Events

As a developer, when NOS receive a merge event from Gitty, the event is multiplexed to web triggers depending on project' configurations.

• Implemented as a Asynchronous listener
• check for a hook configuration
• check if a worker on the same branch already exists
• create the Doc needed by the worker
• schedule work
   

AC:

• When a project contains a configuration matching a gitty event, a web trigger work is scheduled with the proper information