[spring-server] SimplQueryHandler support for DataLoaderRegistry

[dariuszkuc]

📝 Description

When creating new ExecutionInput we should automatically register DataLoaderRegistry if it is present in the application context.

🔗 Related Issues

#381
#396

[codecov-io]

Codecov Report

Merging #400 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master    #400      +/-   ##
===========================================
+ Coverage     97.71%   97.8%   +0.08%     
- Complexity      324     325       +1     
===========================================
  Files           104     104              
  Lines          1226    1228       +2     
  Branches        199     200       +1     
===========================================
+ Hits           1198    1201       +3     
+ Misses            8       7       -1     
  Partials         20      20

Impacted Files	Coverage Δ	Complexity Δ
...pediagroup/graphql/spring/model/GraphQLResponse.kt	100% <ø> (ø)	4 <0> (ø)	⬇️
...iagroup/graphql/spring/GraphQLAutoConfiguration.kt	90% <100%> (+0.52%)	7 <0> (+1)	⬆️
...ediagroup/graphql/spring/execution/QueryHandler.kt	90.9% <100%> (ø)	0 <0> (ø)	⬇️
...xpediagroup/graphql/spring/model/GraphQLRequest.kt	100% <100%> (+9.09%)	4 <0> (ø)	⬇️

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