MAU Pipeline, models, and updated views

[johnbaldwin]

Details:

• Updated methods for figures.sites and figures.mau
• Renamed MAU live data viewset to have 'Live' in the name
• Added models to store MAU site and course metrics
• Created Celery tasks to store MAU metrics
• Added viewsets for MAU stored data
• Added tests, Tests, TESTS!

Closes #135

[codecov-io]

Codecov Report

Merging #134 into master will decrease coverage by 0.02%.
The diff coverage is 95.8%.

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
- Coverage   95.28%   95.26%   -0.03%     
==========================================
  Files          30       31       +1     
  Lines        1358     1498     +140     
==========================================
+ Hits         1294     1427     +133     
- Misses         64       71       +7

Impacted Files	Coverage Δ
figures/urls.py	100% <100%> (ø)	⬆️
figures/migrations/0009_mau_metrics.py	100% <100%> (ø)
figures/serializers.py	96.69% <100%> (+0.15%)	⬆️
figures/mau.py	100% <100%> (ø)	⬆️
figures/filters.py	98.66% <100%> (+0.2%)	⬆️
figures/sites.py	96.2% <88.88%> (-0.99%)	⬇️
figures/tasks.py	81.08% <90%> (+1.39%)	⬆️
figures/views.py	91.24% <94.28%> (-0.47%)	⬇️
figures/models.py	96.87% <94.33%> (-1.8%)	⬇️

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[johnbaldwin]

@melvinsoft Production code should be all here. I'm now just working on improving test coverage.

[OmarIthawi]

Thanks @johnbaldwin.

As discussed in DMs, we're skipping the code review and going directly to staging testing.