perf: Add GraphQL benchmarks

[Stranger6667]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.19%. Comparing base (3b0043c) to head (a180929).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2195      +/-   ##
==========================================
- Coverage   98.23%   98.19%   -0.05%     
==========================================
  Files         132      132              
  Lines       11054    11054              
  Branches     2312     2312              
==========================================
- Hits        10859    10854       -5     
- Misses        114      116       +2     
- Partials       81       84       +3     

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[codspeed-hq]

CodSpeed Performance Report

Merging #2195 will not alter performance

_{Comparing dd/graphql-benchmark (a180929) with master (3b0043c)}

Summary

✅ 28 untouched benchmarks

🆕 3 new benchmarks

Benchmarks breakdown

	Benchmark	master	dd/graphql-benchmark	Change
🆕	test_get_all_operations[gitlab]	N/A	427.5 ms	N/A
🆕	test_get_operation_single[gitlab]	N/A	429.7 ms	N/A
🆕	test_length[gitlab]	N/A	953.2 µs	N/A