Support for streaming/NDJSON

### Description

Please support streaming/NDJSON - this is e.g. used to stream responses from LLMs (like OpenAI).




### Proposal

Related implementations:
https://tanstack.com/query/latest/docs/reference/streamedQuery

### Extra

- [ ] I’m willing to open a PR (see [CONTRIBUTING.md](https://github.com/openapi-ts/openapi-typescript/blob/main/packages/openapi-fetch/CONTRIBUTING.md))