Performance improvements, improve remote $refs

[drwpow]

Changes

• Big performance improvements to the library 🚀🚀🚀
  • Generation for large single-file schemas now happens in < 1s (not including network requests).
  • Memory usage was also improved. Not that it was a problem before, but using less memory can’t hurt 🤷
• Vastly improves $ref resolution. Not only faster; it can resolve deep remote linking across servers (which it struggled with before)
• Fixes Error in generated ts file #973
• Fixes requestBody missing content property #972
• Fixes broken local $ref #715
• Fixes Bug: Headers that use refs aren't included in output #624

How to Review

Tests should pass

Checklist

• Unit tests updated
• README updated
• examples/ directory updated (if applicable)

[codecov]

Codecov Report

Base: 85.75% // Head: 85.01% // Decreases project coverage by -0.73% ⚠️

Coverage data is based on head (d1c6a41) compared to base (7c5c0d4).
Patch coverage: 69.62% of modified lines in pull request are covered.

❗ Current head d1c6a41 differs from pull request most recent head 0f053ec. Consider uploading reports for the commit 0f053ec to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #971      +/-   ##
==========================================
- Coverage   85.75%   85.01%   -0.74%     
==========================================
  Files          13       13              
  Lines        1320     1395      +75     
  Branches      244      250       +6     
==========================================
+ Hits         1132     1186      +54     
- Misses        188      209      +21     

Impacted Files	Coverage Δ
bin/cli.js	81.91% <28.57%> (+1.30%)	⬆️
src/transform/response-object.ts	66.94% <30.76%> (-4.08%)	⬇️
src/utils.ts	80.49% <51.02%> (-3.23%)	⬇️
src/transform/schema-object.ts	87.12% <69.56%> (-1.92%)	⬇️
src/transform/components-object.ts	79.79% <80.00%> (-1.18%)	⬇️
src/transform/request-body-object.ts	97.95% <80.00%> (-2.05%)	⬇️
src/transform/path-item-object.ts	98.27% <83.33%> (+5.41%)	⬆️
src/transform/link-object.ts	100.00% <100.00%> (ø)
src/transform/operation-object.ts	98.11% <100.00%> (+0.11%)	⬆️
src/transform/paths-object.ts	82.05% <100.00%> (-3.37%)	⬇️
... and 1 more

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