Implement get user info usecase

[SivWatt]

👏 解決掉的 issue / Resolved Issues

• close [主線] [PTT] 實作個人看板的使用者資訊usecase #165

📝 相關的 issue / Related Issues

• [主線] [PTT] 實作個人看板的使用者資訊 #52

⛏ 變更內容 / Details of Changes

• usecase
  • 修改 GetUserInformation() 用strconv.FormatInt() 取代 fmt.Sprintf() 以改善效率
  • 新增 UserInformation test case
    • 測試傳入 not exist user 回傳 error
    • 測試傳入正確 user ID 回傳資料

[codecov-commenter]

Codecov Report

Merging #190 (bf32e4f) into development (c85f848) will increase coverage by 2.10%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #190      +/-   ##
===============================================
+ Coverage        41.95%   44.05%   +2.10%     
===============================================
  Files               24       24              
  Lines             1237     1237              
===============================================
+ Hits               519      545      +26     
+ Misses             637      611      -26     
  Partials            81       81              

Impacted Files	Coverage Δ
internal/usecase/user.go	32.71% <100.00%> (+24.29%)	⬆️

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[PichuChen]

LGTM

[y2468101216]

LGTM