GET /genres 実装

[ikura-hamu]

close: #719

全ジャンル取得のAPI

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 53.21%. Comparing base (7848940) to head (3d30740).
Report is 23 commits behind head on develop.

Files	Patch %	Lines
src/repository/gorm2/game_genre.go	86.36%	4 Missing and 2 partials ⚠️
src/handler/v2/game_genre.go	88.46%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #814      +/-   ##
===========================================
+ Coverage    52.29%   53.21%   +0.92%     
===========================================
  Files           91       91              
  Lines         8175     8291     +116     
===========================================
+ Hits          4275     4412     +137     
+ Misses        3632     3607      -25     
- Partials       268      272       +4     

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