Implemente user login on memberkit

[renzon]

close #3817

[codecov]

Codecov Report

Merging #3821 (bca2e50) into master (385da32) will decrease coverage by 0.12%.
The diff coverage is 54.54%.

@@            Coverage Diff             @@
##           master    #3821      +/-   ##
==========================================
- Coverage   95.21%   95.09%   -0.13%     
==========================================
  Files         240      241       +1     
  Lines        7006     7028      +22     
==========================================
+ Hits         6671     6683      +12     
- Misses        335      345      +10     

Impacted Files	Coverage Δ
pythonpro/domain/subscription_domain.py	53.33% <ø> (ø)
pythonpro/memberkit/api.py	90.00% <33.33%> (-7.73%)	⬇️
pythonpro/memberkit/facade.py	85.41% <44.44%> (-9.46%)	⬇️
pythonpro/memberkit/views.py	83.33% <83.33%> (ø)
pythonpro/urls.py	100.00% <100.00%> (ø)

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