[w3ctag/design-reviews] WebXR Plane Detection Module (#620)

Ya ya yawm TAG!

I'm requesting a TAG review of WebXR Plane Detection Module. 

WebXR Plane Detection API allows WebXR-powered experiences to obtain information about planes (flat surfaces) detected in the users' environment. The information about detected planes' poses (position + orientation) and approximate shapes is being surfaced to the application on every XR frame if the feature was enabled on an XR session. This will allow the applications to provide more immersive experiences, for example by leveraging the returned plane information when computing interactions of virtual objects with users' surroundings.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/immersive-web/real-world-geometry/blob/main/plane-detection-explainer.md

  - Specification URL: https://immersive-web.github.io/real-world-geometry/plane-detection.html

  - Tests: N/A yet.
  - Security and Privacy self-review²: https://github.com/immersive-web/real-world-geometry/blob/main/plane-detection-security-privacy-questionnaire.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/immersive-web/real-world-geometry

  - Primary contacts (and their relationship to the specification):
      - Piotr Bialecki, @bialpio, Google, Editor
  - Organization(s)/project(s) driving the specification: Immersive Web CG
  - Key pieces of existing multi-stakeholder review or discussion of this specification:
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5732397976911872


Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)
  - Relevant time constraints or deadlines: N/A - the feature is still being worked on, with a planned Origin Trial in Chrome M91-92
  - The group where the work on this specification is currently being done: Immersive Web CG
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): Immersive Web WG
  - Major unresolved issues with or opposition to this specification: informing about plane changes / removals - see discussion on [spec draft PR](https://github.com/immersive-web/real-world-geometry/pull/27#discussion_r595730915), and [appendix to the explainer](https://github.com/immersive-web/real-world-geometry/blob/main/planes-notifying-about-removal.md).
  - This work is being funded by: N/A.

You should also know that...

This is an early review request, although we already have a rough specification draft so I decided that "Specification review" may be more appropriate.

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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