[w3ctag/design-reviews] First-Party Sets (#342)

Guten TAG！

I'm requesting a TAG review of:

  - Name: First-Party Sets
  - Explainer: https://github.com/mikewest/first-party-sets

  - Primary contacts: @mikewest 

Further details (optional):

  - [X] I am somewhat familiar with the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/), but have not filled out a survey.
  - [X] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

You should also know that y'all are marvelous.

We'd prefer the TAG provide feedback as:

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

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https://github.com/w3ctag/design-reviews/issues/342