[whatwg/fetch] Add bytes() method to Body mixin (PR #1753)

Adds a `bytes()` method to get a `Uint8Array` to `Body`, instead of requiring users to get an `ArrayBuffer` and then wrap it.

- [x] At least two implementers are interested (and none opposed):
   * Chromium: https://github.com/whatwg/fetch/issues/1732#issuecomment-2066280001
   * Gecko: https://github.com/whatwg/fetch/issues/1732#issuecomment-2036463542
   * WebKit: https://github.com/whatwg/fetch/issues/1732#issuecomment-2036440127
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * … <!-- If these tests are tentative, link a PR to make them non-tentative. -->
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
   * Deno (not for CORS changes): …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
- [x] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. <!-- If you created this PR from a single commit, Github copied its message. Otherwise, you need to add a commit message yourself. -->

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


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

  https://github.com/whatwg/fetch/pull/1753

-- Commit Summary --

  * Add bytes() method to Body mixin

-- File Changes --

    M fetch.bs (13)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1753.patch
https://github.com/whatwg/fetch/pull/1753.diff

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