fix: Resolve query fetch result in memory to avoid N+1 query problems

[igdianov]

No description provided.

[codecov]

Codecov Report

Merging #266 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #266   +/-   ##
=========================================
  Coverage     72.27%   72.28%           
- Complexity     1028     1029    +1     
=========================================
  Files            71       71           
  Lines          4689     4690    +1     
  Branches        670      670           
=========================================
+ Hits           3389     3390    +1     
  Misses         1013     1013           
  Partials        287      287           

Impacted Files	Coverage Δ	Complexity Δ
.../jpa/query/schema/impl/GraphQLJpaQueryFactory.java	78.36% <100.00%> (ø)	220.00 <0.00> (ø)
.../query/schema/impl/GraphQLJpaToOneDataFetcher.java	71.42% <100.00%> (+1.05%)	6.00 <0.00> (+1.00)

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