Repository with suspend methods

[alexmihailov]

Update Kotlin to 1.5.31
Move kotlintest to kotest
Add KRepository (with suspend functions)

[codecov-commenter]

Codecov Report

Merging #9 (8257d70) into master (5572e5e) will increase coverage by 4.63%.
The diff coverage is 92.20%.

@@             Coverage Diff              @@
##             master       #9      +/-   ##
============================================
+ Coverage     86.66%   91.30%   +4.63%     
- Complexity       20       39      +19     
============================================
  Files             3        6       +3     
  Lines            45      115      +70     
  Branches          2        6       +4     
============================================
+ Hits             39      105      +66     
+ Misses            4        3       -1     
- Partials          2        7       +5     

Impacted Files	Coverage Δ
...in/org/taymyr/play/repository/domain/Repository.kt	100.00% <ø> (ø)
...astructure/persistence/DatabaseExecutionContext.kt	75.00% <ø> (ø)
...itory/infrastructure/persistence/KJPARepository.kt	90.76% <90.76%> (ø)
...n/org/taymyr/play/repository/domain/KRepository.kt	100.00% <100.00%> (ø)
...ry/infrastructure/persistence/JPABaseRepository.kt	100.00% <100.00%> (ø)
...sitory/infrastructure/persistence/JPARepository.kt	91.89% <100.00%> (+4.39%)	⬆️

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