feat(focus): add createFocusGroup

[jer3m01]

Ports FocusManager from Kobalte to focus.

Also handles keyboard navigation within the focus group.

import { createFocusGroup } from "@solid-primitives/focus";

const [ref, setRef] = createSignal<HTMLElement>();

// Keyboard navigation is attached to the ref automatically.
createFocusGroup(ref);

return (
  <div ref={setRef} role="menu">
    <button role="menuitem">One</button>
    <button role="menuitem">Two</button>
    <button role="menuitem">Three</button>
  </div>
);

[changeset-bot]

🦋 Changeset detected

Latest commit: 3238a1a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@solid-primitives/focus	Patch

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