[w3c/ServiceWorker] Add check for CORS-safelisted methods and headers to foreign fetch. (#1067)

We probably ultimately want to add the extra options to
ForeignFetchOptions as discussed in #880, but for now just limiting
headers and methods to CORS safelisted values seems reasonable, and
matches chrome's implementation.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1067

-- Commit Summary --

  * Add check for CORS-safelisted methods and headers to foreign fetch.

-- File Changes --

    M docs/index.bs (4)
    M docs/index.html (34)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1067.patch
https://github.com/w3c/ServiceWorker/pull/1067.diff

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