[whatwg/fetch] Use `interface mixins` instead of `[NoInterfaceObject]` (#645)

WebIDL recently introduced dedicated syntax for mixins[1]. So, we can
replace `[NoInterfaceObject]` and `implements` with `interface mixin` and
`includes`.

This following interface is impacted by this change:
  - Body

This fixes #624 issue.

Test: https://github.com/w3c/web-platform-tests/pull/8701

[1] https://github.com/heycam/webidl/commit/45e8173d40ddff8dcf81697326e094bcf8b92920
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/645

-- Commit Summary --

  * Use `interface mixins` instead of `[NoInterfaceObject]`

-- File Changes --

    M fetch.bs (9)

-- Patch Links --

https://github.com/whatwg/fetch/pull/645.patch
https://github.com/whatwg/fetch/pull/645.diff

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