fix: compound nested relationship criteria expressions

[igdianov]

The PR fixes problem mapping GraphQL query with nested relation criteria expressions using nested AND: { OR: { expressions } } into JPQL, i.e.

query {
  Authors(where: {
    books: {
      author: { name: {LIKE:"Leo"} }
      AND: {
        OR: {
          id: {EQ: 2}
          title: {LIKE: "Anna"}
        }
      }
    }
  }) {
    select {
      id
      name
      books {
        id
        title
        genre
      }
    }
  }
}  

Should produce the following Hibernate query:

    select
        author0_.id as id1_0_0_,
        books1_.id as id1_2_1_,
        author0_.genre as genre2_0_0_,
        author0_.name as name3_0_0_,
        books1_.author_id as author_i6_2_1_,
        books1_.description as descript2_2_1_,
        books1_.genre as genre3_2_1_,
        books1_.publicationDate as publicat4_2_1_,
        books1_.title as title5_2_1_,
        books1_.author_id as author_i6_2_0__,
        books1_.id as id1_2_0__ 
    from
        Author author0_ 
    inner join
        Book books1_ 
            on author0_.id=books1_.author_id 
    inner join
        Author author2_ 
            on books1_.author_id=author2_.id 
    where
        (
            books1_.id=2 
            or lower(books1_.title) like ?
        ) 
        and (
            lower(author2_.name) like ?
        ) 
    order by
        author0_.id asc,
        books1_.id asc

[codecov]

Codecov Report

Merging #121 into master will increase coverage by 0.04%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##             master     #121      +/-   ##
============================================
+ Coverage     66.37%   66.42%   +0.04%     
- Complexity      381      383       +2     
============================================
  Files            34       34              
  Lines          2031     2031              
  Branches        302      301       -1     
============================================
+ Hits           1348     1349       +1     
  Misses          552      552              
+ Partials        131      130       -1

Impacted Files	Coverage Δ	Complexity Δ
...a/query/schema/impl/QraphQLJpaBaseDataFetcher.java	73.06% <91.66%> (+0.28%)	117 <6> (+2)	⬆️

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