Design Proposal for Focus States in HC Theme

[lboehling]

Need to investigate and provide updated focus appearance guidance and designs for HC theme that meets WCAG AAA guidance: https://www.w3.org/WAI/WCAG22/Understanding/focus-appearance.html

Start with updates to components where we have already customized the focus appearance/are not using browser native focus.

We will need a follow-up issue to implement final design decisions in the core & in the design kit.
patternfly/patternfly#7658 <-- core follow up epic

[lboehling]

Wrote up a proposal for design tokens and styling for a universal focus indicator here:
https://docs.google.com/document/d/1INbIgB8VNJNZ2ZcEE7zS-DwscKX6EQvrjb9blPpfo0g/edit?usp=sharing

Proposal is inline with WCAG AAA guidance, as well as RHDS' guidance.

created a follow up tokens issue.

Probably should created a follow up issue for spec-ing out high priority components with updated tokens/styles for dev hand off.

[andrew-ronaldson]

@phcox @andrew-ronaldson @mcoker @thatblindgeye to review