Piechart statistics

[mom4uk]

closes #ISSUE_ID
Добавил в профиль пай чарт статистику по количеству сыгранных игр на конкретном языке программирования.

[codecov-commenter]

Codecov Report

Merging #1045 (74ac16e) into master (93ed071) will decrease coverage by 0.33%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1045      +/-   ##
==========================================
- Coverage   73.11%   72.77%   -0.34%     
==========================================
  Files         115      116       +1     
  Lines        2161     2171      +10     
==========================================
  Hits         1580     1580              
- Misses        581      591      +10     

Impacted Files	Coverage Δ
services/app/lib/codebattle/user/stats.ex	62.50% <0.00%> (-37.50%)	⬇️
...le_web/controllers/api/v1/lang_stats_controller.ex	0.00% <0.00%> (ø)
...debattle_web/controllers/api/v1/user_controller.ex	58.06% <0.00%> (-13.94%)	⬇️

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[vtm9]

@mom4uk , привет, спасибо за ПР. Я пока временно его закрою, если будут силы и желание, можно будет обновить и смержить