Add functionality to navigate to the next showcase item programmatically

[stephenbellanger]

Description

Currently, the IntroShowcaseState class provides a reset() method to restart the showcase from the initial state.

However, it lacks functionality to programmatically move to the next or previous target in the sequence. This limitation makes it difficult to control the progression of the showcase programmatically, especially in scenarios where the flow of the showcase depends on external logic or user interaction.

Expected Behavior

It would be helpful to have a method like next() that allows developers to programmatically navigate to the next target in the showcase.

Use Case

This functionality would enable developers to:

• Move to the next showcase item based on external events.
• Skip to the next item without requiring user interaction.
• Dynamically control the showcase flow in more complex applications.

Thank you for considering this enhancement! Let me know if further clarification or assistance is needed.