fix(GH-253): Support enable/disable default max result size query pagination

[igdianov]

This PR adds support to enable/disable default max result size query pagination via GraphQLJpaSchemaBuilder.enableDefaultMaxResultSize(boolean) feature toggle. This feature is enabled by default.

Fixes #253

[codecov]

Codecov Report

Merging #254 into master will decrease coverage by 0.09%.
The diff coverage is 40.62%.

@@             Coverage Diff              @@
##             master     #254      +/-   ##
============================================
- Coverage     72.34%   72.24%   -0.10%     
- Complexity     1027     1028       +1     
============================================
  Files            71       71              
  Lines          4672     4688      +16     
  Branches        670      670              
============================================
+ Hits           3380     3387       +7     
- Misses         1005     1013       +8     
- Partials        287      288       +1     

Impacted Files	Coverage Δ	Complexity Δ
...query/schema/relay/GraphQLJpaRelayDataFetcher.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...jpa/query/schema/impl/GraphQLJpaSchemaBuilder.java	88.65% <33.33%> (-0.44%)	127.00 <0.00> (ø)
.../query/schema/impl/GraphQLJpaQueryDataFetcher.java	90.00% <87.50%> (-1.67%)	7.00 <0.00> (ø)
...a/query/schema/impl/GraphQLJpaExecutorContext.java	97.91% <100.00%> (+0.09%)	11.00 <1.00> (+1.00)

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