fix: added support for nested items in menu

[sagardspeed2]

Describe your changes

Added support for nested items in menu

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Issue ticket number and link

Closes #1059

Checklist before requesting a review

• I have performed a self-review of my code
• I have added tests
• I have added a changeset pnpm changeset add
• I have added example usage in the kitchen sink app

[changeset-bot]

🦋 Changeset detected

Latest commit: 74e8310

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

This PR includes changesets to release 4 packages

Name	Type
@ensembleui/react-kitchen-sink	Patch
@ensembleui/react-runtime	Patch
@ensembleui/react-preview	Patch
@ensembleui/react-starter	Patch

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[justEhmadSaeed]

@sagardspeed2
when we add the children to a menu item, it stops following the sidebar styles.

[justEhmadSaeed]

also, we might be needing the support for customItem in the sub-menu as we're doing it for main menu items