feat(openapi-fetch): Allow returning Response from onRequest callback

[p-dubovitsky]

Changes

This PR closes #2072 by adding ability to return Response from onRequest middleware hook. This allows middleware to short-circuit the request chain by returning a response directly, which is useful for cases such as deduplicating or caching responses to avoid unnecessary network requests.

How to Review

Please check that:

• Early Response from onRequest properly skips remaining middleware chain
• Test coverage is sufficient
• Documentation clearly explains new functionality

Key implementation details:

• No changes to existing middleware behavior
• When Response is returned:
  • The request is not sent to the server
  • Subsequent onRequest handlers are skipped
  • onResponse handlers are skipped

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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[changeset-bot]

🦋 Changeset detected

Latest commit: fad2a50

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

This PR includes changesets to release 3 packages

Name	Type
openapi-fetch	Patch
openapi-react-query	Patch
swr-openapi	Patch

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