perf: Optimize direct access to Open API schemas

[Stranger6667]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #2200 will improve performances by ×7.2

_{Comparing dd/perf-direct-access (2c235f0) with master (3400a10)}

Summary

⚡ 2 improvements
✅ 31 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	dd/perf-direct-access	Change
⚡	test_get_operation_single[bbci]	54.2 ms	14.1 ms	×3.8
⚡	test_get_operation_single[vmware]	424 ms	58.6 ms	×7.2

[codecov]

Codecov Report

Attention: Patch coverage is 98.52941% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 98.20%. Comparing base (3400a10) to head (2c235f0).

Files	Patch %	Lines
src/schemathesis/specs/openapi/schemas.py	98.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2200      +/-   ##
==========================================
- Coverage   98.23%   98.20%   -0.03%     
==========================================
  Files         133      133              
  Lines       11112    11108       -4     
  Branches     2319     2309      -10     
==========================================
- Hits        10916    10909       -7     
- Misses        114      117       +3     
  Partials       82       82              

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