[w3ctag/design-reviews] Design review of SameParty cookie attribute (#595)

Hello TAG!

I'm requesting a TAG review of the proposed `SameParty` cookie attribute.

The SameParty cookie attribute provides web developers a means to annotate cookies that are allowed to be set or sent in same-party (where "party" is defined by the collection of domains within the same [First-Party Set](https://github.com/privacycg/first-party-sets)), cross-site contexts; and hence should not be subject to the obsoletion/restrictions planned/shipped for third-party cookies in major browsers. In addition, SameParty cookies are blocked in cross-party, cross-site contexts.

  - Explainer: https://github.com/cfredric/sameparty

  - Security & Privacy self-review: https://github.com/cfredric/sameparty/blob/main/security_and_privacy.md

  - Primary contacts (and their relationship to the specification):
      - @chlily1, author, Google Chrome
      - @krgovind, author, Google Chrome
      - @davidben, author, Google Chrome
      - @cfredric, author, Google Chrome
  - Organization/project driving the design: Google Chrome

Further details:

  - I have reviewed the TAG's [API 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): Plan to be discussed in conjunction with First-Party Sets in PrivacyCG
  - The group where standardization of this work is intended to be done ("unknown" if not known): IETF HTTP Working Group
  - This work is being funded by: Google

You should also know that…

This is related to First-Party Sets, which was previously reviewed and discussed here: https://github.com/w3ctag/design-reviews/issues/342.


We'd prefer the TAG provide feedback as:

  💬 leave review feedback as a **comment in this issue** and @-notify [cfredric, krgovind]



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