chore(ui5-toolbar): toolbar item wrapper introduced

[PetyaMarkovaBogdanova]

feat(ui5-toolbar-item): Refactor to a physical item for enhanced overflow logic

The ui5-toolbar-item has been refactored from an abstract item to a physical item, enabling the transfer of logic for overflowPriority and preventOverflowClosing directly to it.

Key Enhancements:

• Universal Wrapping: The ui5-toolbar-item can now wrap all types of components, allowing them to participate in the overflow toolbar logic seamlessly.
• Pre-defined Wrappers: For certain components, pre-defined wrappers are available. A console warning is displayed to encourage their use when applicable.
• 100% Expansion in Overflow: Components that need to expand fully in the overflow popover can now implement the expandInOverflow property.
• Self Overflow Logic: Components with internal overflow logic can implement the selfOverflowed property.

This enhancement improves flexibility and ensures better integration of components within the overflow toolbar logic.

[dobrinyonkov]

Once we have a sample with different types of components we should test if this click only event handling is enough to manage the closing of the popover. If not we should extend it or think of another mehanism.

[ui5-webcomponents-bot]

🧹 Preview deployment cleaned up: https://pr-12243--ui5-webcomponents.netlify.app