Let's pass and apply distinct in query results if enabled

[igdianov]

Fixes #118

[codecov]

Codecov Report

Merging #124 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #124      +/-   ##
============================================
+ Coverage     67.03%   67.05%   +0.01%     
- Complexity      401      402       +1     
============================================
  Files            33       33              
  Lines          2063     2064       +1     
  Branches        305      306       +1     
============================================
+ Hits           1383     1384       +1     
  Misses          555      555              
  Partials        125      125

Impacted Files	Coverage Δ	Complexity Δ
.../query/schema/impl/GraphQLJpaQueryDataFetcher.java	93.33% <100%> (+0.07%)	22 <0> (+1)	⬆️

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