add curation actions

[drjova]

Configure curation actions from backoffice, the curators/admins, should be able to do the following actions:

• 'Approve'
• 'Reject'
• restart
• skip to step (by default next)
• restart current
• restart with params

We already have the airflow DAGs, we need to have configure the airflow API and document how each one is working.

[DonHaul]

@drjova
This is dependent on:
https://github.com/inspirehep/workflows/pull/2/files#diff-63a9c44a44acf85fea213a857769990937107cf072831e1a26808cfde9d096b9
I have made a few minor changes to the airflow repo so that it can works as intended

[DonHaul]

Another previous step must be implemented which is to trigger workflows in airflow through the backoffice.
An initial version has been implemented in https://github.com/DonHaul/backoffice/tree/submissions .
Needs to be rebased and adapted

[DonHaul]

inspirehep/backoffice#45 first step, it: connects to airflow and triggers dags regarding:

• author creation
• author approval
• author rejection

[DonHaul]

In summary there's 3 new endpoints:

• POST /api/workflows/authors - to create an author. it replaces the previous /api/workflows, receives the same payload
• POST /api/workflows/authors/<id>/resolve receives:

{
  "value": "accept",  #or "reject"
  "create_ticket": true # or false
}

• POST /api/workflows/authors/<id>/restart receives:

{
  "restart_current_task" : true # if not specified defaults to false
  "params" : {dictionary with new params} # this was requested in user action buts its not yet specified what this params are, if not specified, a full restart is done
}

also it can simply have no payload, and in this case a full restart occurs