Added support for disabled state colors

[bheston]

Pull Request

Description

Added disabled state to the interactive color model.
Removed the fixed 30% opacity temporary styling.
Added a Palette for disabled state, defaulting to neutral, which removes the color from accent or highlight components, an additional signal of the disabled state.
Migrated most of the not-allowed cursor support to a global style module. There's something I'd still like to cleanup here regarding components where the whole component should appear disabled vs. only the child elements. This depends on how the empty space works in the components - A list or menu item (full component) compared to an input field with label (more of an "L" shape).

Issues

Closes #91
Related to #79

Reviewer Notes

This feels like a pretty solid update to me, but there are a couple of things I'd still like to cleanup.

• One is the cursor issue mentioned above.
• Another is the black-or-white recipe, which could migrate to another recipe since black and white are at the extents of all palettes. I want to think about this more, so for now I shimmed a reasonable default solution.

Test Plan

Tested in Explorer and Storybook.

Checklist

General

• I have included a change request file using $ npm run change
• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation for this project.

Component-specific

• I have added a new component
• I have modified an existing component

⏭ Next Steps

I found that Slider is not going disabled, but that's happening aside from these changes. Will address separately (#150).

[awentzel]

Code looks clean to me. But, I sent Nate Brown a link to take a look as you want someone that's always in the code to provide feedback. Thanks for keeping things moving.