feat(GH-208): added EQ_, NE_, STARTS_, LIKE_, ENDS_ case insensitive string match criteria

[igdianov]

This PR adds support for case insensitive string match predicate criteria, i.e. EQ_, NE_, STARTS_, LIKE_, ENDS_.

This modifier with force the string value to lower case and apply JPA lower criteria for case insensitive string match in the query.

Fixes #208

[codecov]

Codecov Report

Merging #210 into master will increase coverage by 0.29%.
The diff coverage is 86.27%.

@@             Coverage Diff              @@
##             master     #210      +/-   ##
============================================
+ Coverage     73.76%   74.05%   +0.29%     
- Complexity      878      882       +4     
============================================
  Files            50       50              
  Lines          3720     3754      +34     
  Branches        627      628       +1     
============================================
+ Hits           2744     2780      +36     
+ Misses          698      696       -2     
  Partials        278      278

Impacted Files	Coverage Δ	Complexity Δ
...graphql/jpa/query/schema/impl/PredicateFilter.java	100% <100%> (ø)	7 <2> (+2)	⬆️
...jpa/query/schema/impl/GraphQLJpaSchemaBuilder.java	91.62% <100%> (+0.35%)	118 <0> (ø)	⬇️
...hql/jpa/query/schema/impl/JpaPredicateBuilder.java	59.5% <53.33%> (+0.63%)	112 <0> (+2)	⬆️

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