Added light-weight UserInfo APIs

[kenkoooo]

No description provided.

[codecov-io]

Codecov Report

Merging #73 into master will increase coverage by 0.19%.
The diff coverage is 80.43%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   75.95%   76.15%   +0.19%     
==========================================
  Files          57       60       +3     
  Lines        1285     1325      +40     
  Branches       96       99       +3     
==========================================
+ Hits          976     1009      +33     
- Misses        304      311       +7     
  Partials        5        5

Impacted Files	Coverage Δ
...la/com/kenkoooo/atcoder/db/AcceptedCountInfo.scala	100% <100%> (ø)
...la/com/kenkoooo/atcoder/db/RatedPointSumInfo.scala	100% <100%> (ø)
.../main/scala/com/kenkoooo/atcoder/api/JsonApi.scala	100% <100%> (ø)	⬆️
...la/com/kenkoooo/atcoder/common/ReducedRanker.scala	100% <100%> (ø)
...main/scala/com/kenkoooo/atcoder/db/SqlClient.scala	89.58% <33.33%> (-3.9%)	⬇️
...la/com/kenkoooo/atcoder/model/ApiJsonSupport.scala	93.61% <85.71%> (-1.39%)	⬇️

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