[whatwg/fetch] Call webdriver bidi hooks to clone request and response bodies (PR #1860)

This is a draft PR based on #1540 only meant to illustrate where fetch would hook into BiDi to allow cloning the request and response bodies. 

I will try to rebase and cleanup the whole PR separately but in the meantime we can refer to this for context in https://github.com/w3c/webdriver-bidi/pull/1011


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<a href="https://whatpr.org/fetch/1860.html" title="Last updated on Oct 1, 2025, 2:46 PM UTC (7594c7e)">Preview</a> | <a href="https://whatpr.org/fetch/1860/8d0d207...7594c7e.html" title="Last updated on Oct 1, 2025, 2:46 PM UTC (7594c7e)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1860

-- Commit Summary --

  * Add WebDriver BiDi network request logging
  * Call webdriver bidi hooks to clone request and response bodies

-- File Changes --

    M fetch.bs (51)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1860.patch
https://github.com/whatwg/fetch/pull/1860.diff

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