Add account statistics report

[Jzow]

CC #118 #124

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (f5222c6) 3.08% compared to head (c4d3ed1) 3.07%.
Report is 27 commits behind head on master.

Files	Patch %	Lines
...va/com/wansenai/vo/report/AccountStatisticsVO.java	0.00%	8 Missing ⚠️
...wansenai/dto/report/QueryAccountStatisticsDTO.java	0.00%	5 Missing ⚠️
...java/com/wansenai/api/report/ReportController.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             master    #198      +/-   ##
===========================================
- Coverage      3.08%   3.07%   -0.01%     
  Complexity       30      30              
===========================================
  Files           231     233       +2     
  Lines          4349    4363      +14     
  Branches        226     226              
===========================================
  Hits            134     134              
- Misses         4201    4215      +14     
  Partials         14      14              

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