fix(Pagination): ignore clicks if pagination button is disabled

[andreww2012]

Pagination buttons (like prev/next) can become any HTML element, for example <a>, which, unlike <button>, doesn't support disabled attribute and still emits click events.

If a pagination button component is considered disabled, but rendered as a non-button HTML element, clicking it may update the component's state in a bad way (for example, set the current page to 0 after clicking the "<" button when being on the first page).

This PR adds !disabled && conditions to all pagination buttons components' click event handlers.

[zernonia]

Nicely done @andreww2012 !!

Thanks for adding the test case too! 🚀