[w3ctag/design-reviews] User Preference Media Features Client Hints Headers (#632)

Ya ya yawm TAG!

I'm requesting a TAG review of _User Preference Media Features Client Hints Headers_, a set of
[HTTP Client Hints](https://datatracker.ietf.org/doc/html/rfc8942) headers around [user preference media features](https://drafts.csswg.org/mediaqueries-5/#mf-user-preferences) as defined by [Media Queries Level 5](https://drafts.csswg.org/mediaqueries-5/#descdef-media-prefers-color-scheme).

  - Explainer¹ (minimally containing user needs and example code): https://github.com/tomayac/user-preference-media-features-headers/blob/main/README.md

  - Spec (draft): https://tomayac.github.io/user-preference-media-features-headers/

  - Security and Privacy self-review²: https://github.com/tomayac/user-preference-media-features-headers/blob/main/security-privacy-questionnaire.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/tomayac/user-preference-media-features-headers

  - Primary contacts (and their relationship to the specification):
      - Thomas Steiner (@tomayac), Google, spec author
      - Yoav Weiss (@yoavweiss), Google, spec buddy
      - François Beaufort (@beaufortfrancois), Google, Chromium implementer
  - Organization/project driving the design: Google
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5642300464037888


Further details:

  - [X] I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future): WICG (in the future)
  - The group where standardization of this work is intended to be done ("unknown" if not known): unknown
  - Existing major pieces of multi-stakeholder review or discussion of this design: https://github.com/w3c/csswg-drafts/issues/4162

  - Major unresolved issues with or opposition to this design: Should `Sec-CH-Prefers-Reduced-Data` be defined for consistency, or yield to the existing `Save-Data` header?
  - This work is being funded by: Google

You should also know that...

This is a feature we (Google) are hoping to use for Google Search ([google.com](https://www.google.com/)).

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  🐛 open issues in our GitHub repo for **each point of feedback**

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