Smooth scroll an item into view

[slidenerd]

Clear and concise description of the problem

• Currently the library has a scrollToItem method but the behavior is not smooth

Suggested solution

• Implement a function to smooth scroll into view

Alternative

No response

Additional context

Something like this but for the virtual scroller. Found nothing here

Validations

• [X] Read the docs.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.