fix: handle async response transformers

[mrlubos]

Closes #730

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 1, 2024 6:18am

[changeset-bot]

🦋 Changeset detected

Latest commit: 8410046

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@hey-api/client-fetch	Patch
@hey-api/openapi-ts	Patch
@example/openapi-ts-fetch	Patch

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 73.31%. Comparing base (0a31408) to head (8410046).

Files	Patch %	Lines
...ackages/openapi-ts/src/utils/write/transformers.ts	0.00%	6 Missing ⚠️
packages/openapi-ts/src/compiler/types.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #736      +/-   ##
==========================================
- Coverage   73.37%   73.31%   -0.07%     
==========================================
  Files          78       78              
  Lines        8271     8278       +7     
  Branches      772      772              
==========================================
  Hits         6069     6069              
- Misses       2197     2204       +7     
  Partials        5        5              

Flag	Coverage Δ
unittests	73.31% <0.00%> (-0.07%)	⬇️

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