Feature: add default controls callbacks, onUserNavigation callback

[fritz-c]

Description

Adds:

• Three new callbacks for the default controls: nextButtonOnClick, prevButtonOnClick, pagingDotsOnClick
• A new callback,onUserNavigation, called whenever a user interaction triggered carousel navigation.
• An expanded type to nextButtonText and prevButtonText props, allowing for any element instead of just strings

The onUserNavigation callback in particular will provide a simple fix for a couple existing issues that want to pause autoplay following user interaction: Fixes #918 Fixes #499

Type of Change

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

New unit tests

[vercel[bot]]

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Name	Status	Preview	Updated
nuka-carousel	✅ Ready (Inspect)	Visit Preview	Sep 12, 2022 at 7:23PM (UTC)