Add account statistics report

[Jzow]

CC #118 #124

[codecov[bot]]

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 :warning:
...wansenai/dto/report/QueryAccountStatisticsDTO.java	0.00%	5 Missing :warning:
...java/com/wansenai/api/report/ReportController.java	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ 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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