[w3ctag/design-reviews] WebXR Hit Test Module (#463)

Hello TAG!

I'm requesting a TAG review of WebXR Hit Test Module.

Exposes hit-testing (raycasting) capability for WebXR. This API would allow a developer to cast a ray into the real world and return a list of intersection points for that ray against whatever world understanding the underlying system gathers.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/immersive-web/hit-test/blob/master/hit-testing-explainer.md

  - Specification URL: https://immersive-web.github.io/hit-test/

  - Tests: **WIP: update incoming**
  - Security and Privacy self-review²: **WIP: update incoming**
  - GitHub repo (if you prefer feedback filed there): https://github.com/immersive-web/hit-test

  - Primary contacts (and their relationship to the specification): 
      - Piotr Bialecki, @bialpio, Google, Editor
      - Trevor F. Smith, @TrevorFSmith, CG Chair
      - Ada Rose Cannon, @AdaRoseCannon, Samsung, WG Chair
      - Chris Wilson, @cwilso, Google, WG Chair
  - Organization(s)/project(s) driving the specification: Immersive Web CG
  - Key pieces of existing multi-stakeholder review or discussion of this specification: N/A
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
    - Chrome Status: https://chromestatus.com/feature/4755348300759040


Further details:

  - [X] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - Relevant time constraints or deadlines: Chrome will have an Intent to Ship soon for this API.
  - The group where the work on this specification is being done: Immersive Web CG.
  - Major unresolved issues with or opposition to this specification: N/A
  - This work is being funded by: N/A

You should also know that...

  - N/A

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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