Pass reporting period as a command line argument

[smirolo]

The report_weekly_revenue Django command reports revenue ... per week. :)

We would like to enable passing a command line argument such that the report is "hourly", "daily", "weekly", "monthly" and "yearly".

Ideally we would also like the metrics report page (http://localhost:8000/metrics/cowork/revenue/#cash) to also support a reporting period choice ("hourly", "daily", "weekly", "monthly" and "yearly").

References:

• https://github.com/djaodjin/djaodjin-saas/blob/master/saas/management/commands/report_weekly_revenue.py
• https://github.com/djaodjin/djaodjin-saas/blob/45def252d7694073b19c0837614bd414161fa700/saas/models.py#L2672
• https://www.djaodjin.com/blog/timezones-javascript-django-postgresql.blog.html

[smirolo]

This was implemented in multiple commits by @Deep-Chill (notably commit e153fd38 and commit d22ba043). I will leave open until automated testing has been setup for these features. Thank you!

[smirolo]

tests implemented as part of the nightwatchjs testsuite.