Implemented user statistics on module tree

[renzon]

close #2271

[codecov]

Codecov Report

Merging #2945 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2945      +/-   ##
==========================================
+ Coverage   95.48%   95.53%   +0.05%     
==========================================
  Files         209      209              
  Lines        6023     6073      +50     
==========================================
+ Hits         5751     5802      +51     
+ Misses        272      271       -1     

Impacted Files	Coverage Δ
pythonpro/checkout/facade.py	100.00% <100.00%> (ø)
pythonpro/domain/content_statistics_domain.py	100.00% <100.00%> (+1.07%)	⬆️
pythonpro/modules/facade.py	100.00% <100.00%> (ø)
pythonpro/modules/modules_views.py	100.00% <100.00%> (ø)
pythonpro/modules/tests/test_module_detail_view.py	100.00% <100.00%> (ø)
pythonpro/modules/tests/test_sections_view.py	100.00% <100.00%> (ø)

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