chore: remove obsolete JpaQueryBuilder class

[igdianov]

Fixes #19

[codecov]

Codecov Report

Merging #190 into master will increase coverage by 2.71%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #190      +/-   ##
============================================
+ Coverage     70.97%   73.68%   +2.71%     
  Complexity      874      874              
============================================
  Files            51       50       -1     
  Lines          3845     3702     -143     
  Branches        660      627      -33     
============================================
- Hits           2729     2728       -1     
+ Misses          838      696     -142     
  Partials        278      278

Impacted Files	Coverage Δ	Complexity Δ
...hql/jpa/query/schema/impl/JpaPredicateBuilder.java	58.59% <100%> (+1.96%)	109 <2> (+1)	⬆️
...a/query/schema/impl/QraphQLJpaBaseDataFetcher.java	75.62% <100%> (ø)	167 <0> (ø)	⬇️

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