Add project connector api endpoint
    
    This endpoint aims to provide a get access to connector
    tokens that are:
    - project hook token
    - project's user (caller) API token
    
    I call them connector data as those tokens are the
    mandatory data an application should have to verify project
    events received via the Web hooks but also to perform actions
    via the API to a given project.
    
    The endpoint is only available to project's owner and admin
    users with a 'modify_project' ACL token.
    
    Thanks to this endpoint, a user (or an application) added as
    admin on one or more projects, and via its user token, would
    be able to read connector data on those projects and then
    received events and perform API call on those same projects.