[w3ctag/design-reviews] CSS color-mix function (#526)

Saluton TAG!

I'm requesting a TAG review of the CSS color-mix function.

color-mix takes two color specifications and returns the result of mixing them, in a given colorspace, by a specified amount. For example, `color-mix(red yellow 40%)` produces a mixture of 40% red and 60% yellow.

  - Specification URL: https://drafts.csswg.org/css-color-5/#color-mix

  - Tests: None exist yet; will write them as part of feature development
  - Primary contacts (and their relationship to the specification):
      - CSSWG for the specification
      - @kbabbitt for the Chromium implementation
  - Organization(s)/project(s) driving the specification: CSSWG
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
      - https://www.chromestatus.com/feature/5659115386830848

      - https://bugs.chromium.org/p/chromium/issues/detail?id=1092638


Further details:

  - ✔️ I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the work on this specification is currently being done: CSSWG
  - Major unresolved issues with or opposition to this specification:
      - This feature is less generally useful without support for Lab/LCH color spaces, which are under discussion in https://github.com/w3ctag/design-reviews/issues/488. However, we need color-mix in sRGB space in order to implement the resolution in https://github.com/w3c/csswg-drafts/issues/4915 regarding background-color in forced colors mode.

We'd prefer the TAG provide feedback as (please delete all but the desired option):

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


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