Partial refactor of statistics code

[anorthall]

A complete refactor of trip statistics, moving the functionality into its own Django application and refactoring all code to be reusable and testable.

[codecov]

Codecov Report

Patch coverage: 99.70% and project coverage change: +3.69 🎉

Comparison is base (ebb13d3) 91.40% compared to head (ff0200f) 95.09%.

❗ Current head ff0200f differs from pull request most recent head ea00c79. Consider uploading reports for the commit ea00c79 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   91.40%   95.09%   +3.69%     
==========================================
  Files          84       94      +10     
  Lines        3758     4040     +282     
==========================================
+ Hits         3435     3842     +407     
+ Misses        323      198     -125     

Impacted Files	Coverage Δ
app/logger/admin.py	100.00% <ø> (+3.33%)	⬆️
app/logger/views.py	91.63% <95.83%> (+0.28%)	⬆️
app/core/tests/test_news_and_faqs.py	100.00% <100.00%> (ø)
app/core/tests/test_pages_load.py	100.00% <100.00%> (ø)
app/core/utils.py	100.00% <100.00%> (ø)
app/logger/tests/test_social_functionality.py	100.00% <100.00%> (ø)
app/logger/tests/test_trip_model.py	100.00% <100.00%> (ø)
app/stats/apps.py	100.00% <100.00%> (ø)
app/stats/statistics/__init__.py	100.00% <100.00%> (ø)
app/stats/statistics/averages.py	100.00% <100.00%> (ø)
... and 10 more

... and 5 files with indirect coverage changes

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