Spec forDebuggingOnly API (WICG#977)

* Spec forDebuggingOnly APIs.

* [Spec] Add forDebuggingOnly API.

* finish

* Some fixes.

* Fixes.

* Address comments. Add reporting helper.

* Fix problems.

* small fixes.

* update a comment for [=no bid=]

* indent fix.

* fix more indent

* Address comments

* revert some unrelated fixes/cleanups

* one more tiny revert

* Add an id field to generated bid

* small fix

* Add an issue for generatedBids.

* link to an issue.

* Apply suggestions from code review

Co-authored-by: Dominic Farolino <domfarolino@gmail.com>

* Address comments

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Co-authored-by: Qingxin Wu <qingxinwu@google.com>
Co-authored-by: Dominic Farolino <domfarolino@gmail.com>