[w3ctag/design-reviews] Review request on Render Blocking Status in Resource Timing (Issue #753)

Wotcher TAG!

I'm requesting a TAG review of Render Blocking Status in Resource Timing.

Adds a field to PerfomanceResourceTiming to indicate the render blocking status of a resource. Currently from a developer perspective, the only way to determine which resources were actually render blocking is to rely on complex heurestics. The new field would instead provide a direct signal regarding the same.

  - Explainer: https://github.com/abinpaul1/resource-timing/blob/render-blocking-status-explainer/Explainer/Render_Blocking_Status.md

  - Specification URL: https://github.com/w3c/resource-timing/pull/327

  - Tests: WIP : https://github.com/web-platform-tests/wpt/pull/34628

  - User research: None
  - Security and Privacy self-review: https://gist.github.com/abinpaul1/dbe7e378aaf31cf2bf5308289f8e5712

  - Primary contacts (and their relationship to the specification):
      - Abin K Paul (@abinpaul1), spec author
      - Yoav Weiss (@yoavweiss), Google, spec mentor
  - Organization(s)/project(s) driving the specification: Google
  - Key pieces of existing multi-stakeholder review or discussion of this specification: 
     - Discussion in WebPerf WG call : https://docs.google.com/document/d/1VKlWpadbyq2iv35JVVUdxFuB2mshEHP_ArPcij8fpk8/edit#heading=h.9gqz90lre5ux

     - Positive reception from Mozilla : https://github.com/mozilla/standards-positions/issues/662#issuecomment-1171568555

  - External status/issue trackers for this specification: https://chromestatus.com/feature/5166965277589504


Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Relevant time constraints or deadlines: September 1, 2022
  - The group where the work on this specification is currently being done: W3C Web Performance WG
  - Major unresolved issues with or opposition to this specification: None
  - This work is being funded by: Google

You should also know that...

Reception towards a similar feature introduced in Chromium was very positive. The article and tweet linked below is a good indicator.
- https://blog.webpagetest.org/posts/new-render-blocking-indicator-in-chrome-and-webpagetest/ 
- https://twitter.com/tkadlec/status/1417543014705246214


We'd prefer the TAG provide feedback as :

  💬 leave review feedback as a **comment in this issue** and @-notify @abinpaul1 @yoavweiss

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