GraphQL classConfig query alias

[BufferUnderflower]

Solves #6218

Adds getAlias and findAlias for GraphQL classConfig.
e.g.

{
...
classConfigs: [
          {
            className: 'Data',
            query: {
              get: true,
              getAlias: 'precious_data',
              find: true,
              findAlias: 'data_results',
            },
          },
]}

[codecov]

Codecov Report

Merging #6257 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6257      +/-   ##
==========================================
- Coverage   93.96%   93.93%   -0.04%     
==========================================
  Files         169      169              
  Lines       11529    11536       +7     
==========================================
+ Hits        10833    10836       +3     
- Misses        696      700       +4

Impacted Files	Coverage Δ
src/GraphQL/loaders/parseClassQueries.js	97.95% <100%> (+0.08%)	⬆️
src/Controllers/ParseGraphQLController.js	95.71% <100%> (+0.15%)	⬆️
src/Adapters/Storage/Mongo/MongoStorageAdapter.js	92.74% <0%> (-0.71%)	⬇️
src/RestWrite.js	93.42% <0%> (-0.17%)	⬇️

---

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[davimacedo]

I like the idea. Are you willed to do the same also for mutations? :)