Should be able to generate committee attendance report from an external service

[OriHoch]

This issue is part of a bigger issue, you should read the main issue(#667) first.

user story

Abigail wants to get a report about committee attendance per MK.

expected

• She will use the committee attendance service which will connect to the main Open Knesset servers via an authenticated REST API.
• The REST API will make sure Abigail has the relevant permissions to use this api.

  actual

• Abigail has to ask an Open Knesset admin to generate this report for her.

  Description

• Should take the code in mks/management/commands/committee_attendance_report.py and committee_details_attendance_report.py and move it to a new repository
  • This new repository could be called "Open-Knesset-Services"
  • The Open-Knesset-Services repository should be language-agnostic (in this case it's python, but we should welcome services written in other languages as well)
  • for example, in this case it could be at Open-Knesset-Services/python/mks/committee_attendance_report.py
• in Open-Knesset repo - should develop a new REST API which will be authenticated
• The code (committee_attendance_report) should be modified to use this rest api instead of directly calling the Django ORM.

[alonisser]

@OriHoch besides what I wrote in #667 this might be separated into:

1. Adding a consumable api for committee attendance - which I certainly think is needed
2. The new service, which I'm not sure how would exactly help us