[whatwg/fetch] Add chunk type checking of requestForServiceWorker's body's stream (#1199)

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- [x] At least two implementers are interested (and none opposed):
   * Chrome
   * Firefox
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * TBD
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: TBD
   * Firefox: N/A as streaming request body has not been implemented.
   * Safari: N/A as streaming request body has not been implemented.

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

Fixes #267.

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1199

-- Commit Summary --

  * tmp

-- File Changes --

    M fetch.bs (24)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1199.patch
https://github.com/whatwg/fetch/pull/1199.diff

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