feat: implement adoptedStyleSheets + optional native CSS nesting

[shaal]

Description

This PR simplifies how we add slot styles from within the component.

• Style Manager controller does the following:

• Reads the CSS (that alternatively could be loaded globally by the consumer)

• Only if generateRandomId === true -

  • Generate unique ID for the component (highest specificity)
  • Formats the CSS as a string, strips :host and :root
  • Uses native CSS nesting to add the unique ID ahead of the CSS rules

• Uses adoptedStylesheets to modify the document's CSS (instead adding CSS into the DOM)

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[himerus]

I think a lot of this is great.

We need to, however, consider the browser impact of the Native CSS nesting. It limits us to more browsers than adoptedStylesheet does presently. In 6 months, maybe a year, I think we'll be there. Based on several discussions around the browser support and our ongoing requirements, it's not a safe time to implement native nesting. We still have (and will for some time) have postcss in our toolchain.

If we could:

• Remove CSS Nesting
• Evaluate addPrefixToCurlyGroups when we aren't using native nesting
• Focus on the functionality of addSlotStyles

This controller should primarily be responsible for:

• Attaching a previously processed CSS file to adoptedStylesheet
• Optionally wrapping the CSS file in a configurable selector. (Random ID, Class, Component, etc.)

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[himerus]

Closing in favor of the slim @phase2/outline-adopted-stylesheets-controller controller