Add support for lazy loaded attribute fetching with JPA entity graph query hint

[igdianov]

To add query support for entities with lazy attributes compiled using Hibernate bytecode enhancement plugin.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (17120b6) 75.54% compared to head (da61133) 75.73%.

Files	Patch %	Lines
.../jpa/query/schema/impl/GraphQLJpaQueryFactory.java	91.66%	0 Missing and 5 partials ⚠️
...ventures/graphql/jpa/query/schema/JavaScalars.java	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #387      +/-   ##
============================================
+ Coverage     75.54%   75.73%   +0.19%     
- Complexity     1150     1175      +25     
============================================
  Files            76       76              
  Lines          5181     5239      +58     
  Branches        739      747       +8     
============================================
+ Hits           3914     3968      +54     
  Misses          940      940              
- Partials        327      331       +4     

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