fix(api-gateway): GraphQL boolean filters

[vasilev-alex]

load was renamed to cube

query CubeQuery {
  cube(timezone: "UTC") {
    orders {
      status
      createdAt {
        value 
      }
    }
  }
}

[codecov]

Codecov Report

Merging #3776 (6a88251) into master (f9d9ecc) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head 6a88251 differs from pull request most recent head d8b6b96. Consider uploading reports for the commit d8b6b96 to get more accurate results

@@            Coverage Diff             @@
##           master    #3776      +/-   ##
==========================================
- Coverage   57.79%   57.78%   -0.02%     
==========================================
  Files         126      126              
  Lines       10532    10543      +11     
  Branches     2483     2489       +6     
==========================================
+ Hits         6087     6092       +5     
- Misses       4162     4168       +6     
  Partials      283      283              

Impacted Files	Coverage Δ
packages/cubejs-api-gateway/src/graphql.ts	4.58% <0.00%> (-0.21%)	⬇️
...es/cubejs-schema-compiler/src/adapter/BaseQuery.js	64.07% <0.00%> (+0.41%)	⬆️

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