Add a new color field type

The Needs Review Queue Bot → tested this issue. It either no longer applies to Drupal core, or fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

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There are about 30,000 Drupal 8+ sites using https://www.drupal.org/project/color_field → , which is a fair amount, but I'm not sure it's enough to justify adding the field type to core. We're already considering moving telephone to contrib since that isn't widely used. Moving this to the core ideas queue for new feature evaluation.

Moving this to Drupal CMS - if this field was in heavy use in Drupal CMS or experience builder, then it could end up being a core candidate, but if not, I think it is fine for it to live in contrib.

We have no need for it now, so I don't see any reason to keep this open. Generally our approach is to add a module as the need arises, so if in future we need it, we will add it.

Let's go back to Drupal core then.

Also, note that https://www.drupal.org/project/color_field → module has currently 53,021 reported installs, which as of now it is more than what Drupal CMS has. So there is at least some "need".

For core evaluation this first needs an issue summary update for what exactly is being proposed for addition for core, who is planning to do the work, whether it would start as an experimental module etc., and then once that's available it will need product manager review.

Removing "Needs product manager review" tag, as I understand the stated steps need to happen first