[w3ctag/design-reviews] Add `id` member to web application manifest spec (#668)

Ya ya yawm TAG!

I'm requesting a TAG review of manifest unique id.

What uniquely identifies a web application is not defined in [app manifest specification](https://www.w3.org/TR/appmanifest/). This proposes adding an `id` member to the manifest with details about how it should be utilized during manifest parsing and update. 

  - Explainer¹ (minimally containing user needs and example code): https://github.com/philloooo/pwa-unique-id/blob/main/explainer.md

  - Specification URL: https://github.com/w3c/manifest/pull/988

  - Tests: [wpt folder(s), if available]
  - Security and Privacy self-review²: No security and privacy risks are expected since this doesn't expose any user information.
  - GitHub repo (if you prefer feedback filed there): https://github.com/philloooo/pwa-unique-id/issues

  - Primary contacts (and their relationship to the specification):
      - [Phillis Tang] (@philloooo), [Google], implementor
      - [Daniel Murphy] (@dmurph), [Google], co-implementor
      - [Marcos Cáceres] (@marcoscaceres), [W3C], spec editor
  - Organization(s)/project(s) driving the specification: Google
  - Key pieces of existing multi-stakeholder review or discussion of this specification: https://github.com/w3c/manifest/issues/586

  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://www.chromestatus.com/features/6064014410907648


Further details:

  - [ ] I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)
  - Relevant time constraints or deadlines: [please provide]
  - The group where the work on this specification is currently being done:
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue):
  - Major unresolved issues with or opposition to this specification:
  - This work is being funded by:

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 delete all but the desired option):

  🐛 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.

In particular, if anything links to a URL which requires authentication (e.g. Google document), please make sure anyone with the link can access the document. We would prefer fully public documents though, since we work in the open.

¹ We require an explainer to give the relevant context for the spec review, even if the spec has some background information. For background, see our [explanation of how to write a good explainer](https://w3ctag.github.io/explainers). We recommend the explainer to be in [Markdown](https://github.github.com/gfm/).

² A Security and Privacy questionnaire helps us understand potential security and privacy issues and mitigations for your design, and can save us asking redundant questions. See https://www.w3.org/TR/security-privacy-questionnaire/.



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