fix(GH-38): Support JPA @ElementCollection annotation with @Embeddable generic type

[igdianov]

Fixes #38

[codecov]

Codecov Report

Merging #270 into master will decrease coverage by 0.03%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master     #270      +/-   ##
============================================
- Coverage     72.28%   72.24%   -0.04%     
- Complexity     1029     1031       +2     
============================================
  Files            71       72       +1     
  Lines          4690     4698       +8     
  Branches        670      672       +2     
============================================
+ Hits           3390     3394       +4     
- Misses         1013     1017       +4     
  Partials        287      287              

Impacted Files	Coverage Δ	Complexity Δ
...ures/graphql/jpa/query/schema/model/book/Book.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...graphql/jpa/query/schema/model/book/Publisher.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../jpa/query/schema/impl/GraphQLJpaQueryFactory.java	78.36% <ø> (ø)	220.00 <0.00> (ø)
...jpa/query/schema/impl/GraphQLJpaSchemaBuilder.java	88.71% <75.00%> (+0.05%)	129.00 <0.00> (+2.00)

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