Adding entity reference query functionality.

[fubhy]

No description provided.

[codecov]

Codecov Report

Merging #660 into 8.x-3.x will decrease coverage by 0.12%.
The diff coverage is 73.58%.

@@             Coverage Diff             @@
##           8.x-3.x     #660      +/-   ##
===========================================
- Coverage    80.05%   79.92%   -0.13%     
===========================================
  Files          186      188       +2     
  Lines         2928     2984      +56     
===========================================
+ Hits          2344     2385      +41     
- Misses         584      599      +15

Impacted Files	Coverage Δ
...n/Deriver/Fields/EntityReferenceReverseDeriver.php	100% <ø> (ø)	⬆️
...QL/Fields/EntityReference/EntityReferenceQuery.php	0% <0%> (ø)
...gin/Deriver/Fields/EntityReferenceQueryDeriver.php	100% <100%> (ø)
.../Plugin/GraphQL/Fields/EntityQuery/EntityQuery.php	74.31% <50%> (-0.69%)	⬇️
...e/src/Plugin/GraphQL/Enums/Images/ImageStyleId.php	95.23% <0%> (-4.77%)	⬇️

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