[w3ctag/design-reviews] TAG review requested: Feature Policy JS introspection API (#292)

Hello TAG！

I'm requesting a TAG review of:

  - Name: Feature Policy: **JavaScript policy introspection**
  - Specification URL: [PR](https://github.com/WICG/feature-policy/pull/184), [published as draft here](https://drafts.featurepolicy.rocks/add-introspection/#introspection) (See section 7, specifically). 
  - Explainer, Requirements Doc, or Example code: See introduction and examples in [draft](https://drafts.featurepolicy.rocks/add-introspection/#introspection-overview)
  - Tests: This API is tested in [WPT/feature-policy](https://wpt.fyi/results/feature-policy), specifically with the `feature-policy-frame-policy-*`, `feature-policy-header-policy-*`, and `feature-policy-nested-header-policy-*` tests. Once available, this API can also be used to test many other policy-controlled features, as well.
  - Primary contacts: iclelland

Further details (optional):

  - Relevant time constraints or deadlines: [please provide]
  - [x] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/). The [assessment is here](https://github.com/WICG/feature-policy/blob/master/security-privacy-questionnaire-introspection.md).
  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

You should also know that...

[please tell us anything you think is relevant to this review]

We'd prefer the TAG provide feedback as (please select one):

  - [x] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [ ] leave review feedback as a comment in this issue and @-notify [github usernames]

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_Please preview the issue and check that the links work before submitting_

For background, some decent explainers:

  https://github.com/w3c/ServiceWorker/blob/master/explainer.md
  https://github.com/zkoch/paymentrequest/blob/gh-pages/docs/explainer.md
  https://github.com/WICG/IntersectionObserver/blob/gh-pages/explainer.md (although this one includes IDL, which an explainer should not)


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