[whatwg/fetch] Define parsing for X-Content-Type-Options in detail (#818)

And add some of the infrastructure needed to define parsing better for all headers going forward (needed for #814). Fixes #752.

This also fixes an issue with CORB as it simply assumed an X-Content-Type-Options was present.

Tests: https://github.com/web-platform-tests/wpt/pull/13559.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/818

-- Commit Summary --

  * Define parsing for X-Content-Type-Options in detail

-- File Changes --

    M fetch.bs (63)

-- Patch Links --

https://github.com/whatwg/fetch/pull/818.patch
https://github.com/whatwg/fetch/pull/818.diff

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