feat(GH-226): Support logging of the generated JPQL query string with debug log level

[igdianov]

Fixes #226

Configured by DEBUG logging level on com.introproventures.graphql.jpa.query.schema package.

logging:
  level:
    com.introproventures.graphql.jpa.query.schema: DEBUG

Then, log output will produce:

2019-12-14 17:27:36.865  INFO 5868 --- [nio-8080-exec-8] c.i.g.j.q.s.i.GraphQLJpaQueryDataFetcher : 
GraphQL JPQL Query String:
    select distinct droid from Droid as droid left join fetch droid.friends as generatedAlias0 left join fetch generatedAlias0.friendsOf as generatedAlias1 where generatedAlias1.name=:param0 order by droid.id asc

[codecov]

Codecov Report

Merging #227 into master will increase coverage by 0.28%.
The diff coverage is 63.63%.

@@             Coverage Diff              @@
##             master     #227      +/-   ##
============================================
+ Coverage     73.48%   73.76%   +0.28%     
- Complexity      845      856      +11     
============================================
  Files            49       49              
  Lines          3651     3698      +47     
  Branches        606      607       +1     
============================================
+ Hits           2683     2728      +45     
- Misses          704      706       +2     
  Partials        264      264

Impacted Files	Coverage Δ	Complexity Δ
.../query/schema/impl/GraphQLJpaQueryDataFetcher.java	88.57% <63.63%> (-2.92%)	27 <2> (+2)
...phql/jpa/query/schema/impl/GraphQLJpaExecutor.java	100% <0%> (ø)	4% <0%> (+1%)	⬆️
.../example/starwars/StarwarsSchemaConfiguration.java	100% <0%> (ø)	8% <0%> (+4%)	⬆️
.../query/example/books/BooksSchemaConfiguration.java	100% <0%> (ø)	7% <0%> (+3%)	⬆️
.../graphql/jpa/query/introspection/Constructors.java	82% <0%> (+4%)	15% <0%> (+1%)	⬆️

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