[w3ctag/design-reviews] Cookies Having Independent Partitioned State (CHIPS) (#654)

Guten TAG!

I am requesting a review of Cookies Having Independent Partitioned State (a.k.a. CHIPS), a proposal for opt-in cookie jar partitioning by top-level site.

This proposal introduces a new Set-Cookie header attribute, `Partitioned`, which servers can use to opt-in to having their cross-site cookies by top-level [site](https://html.spec.whatwg.org/#sites).

  - Explainer¹ (minimally containing user needs and example code): https://github.com/WICG/CHIPS

  - Security and Privacy self-review²: https://github.com/WICG/CHIPS/blob/main/TAG-S%26P-questionnaire.md

  - Primary contacts (and their relationship to the specification):
      - Kaustubha Govind (@krgovind), Google
      - Dylan Cutler (@DCtheTall), Google
  - Organization/project driving the design: Google
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): N/A (for now)

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
  - The group where standardization of this work is intended to be done ("unknown" if not known): IETF HTTP WG or WebAppSec WG
  - Existing major pieces of multi-stakeholder review or discussion of this design: https://github.com/WICG/CHIPS/issues

  - Major unresolved issues with or opposition to this design: https://github.com/WICG/CHIPS/issues

  - This work is being funded by: Google

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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