[whatwg/fetch] Add maxByteLength option to Body consume utilities (PR #1600)

This commit adds an option bag to `Body/arrayBuffer`, `Body/blob`, `Body/formData`, `Body/json`, and `Body/text` that allows configuration of a max byte length for the underlying consumed body. This allows a developer to limit how much data their application parses without having to resort to a costly user-land TransformStream that may break internal optimizations of the body consume helpers.

---

- [ ] At least two implementers are interested (and none opposed):
   * Deno
   * Cloudflare Workers
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
   * Deno: …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …

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

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

  https://github.com/whatwg/fetch/pull/1600


-- Commit Summary --

  * Add maxByteLength option to Body consume utilities

-- File Changes --

    M fetch.bs (75)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1600.patch

https://github.com/whatwg/fetch/pull/1600.diff


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