refactor to function component and upgrade dependencies

[tyrmit]

1. Refactor InfiniteScroll class to function component
2. Upgrade all dependencies to latest versions
3. Fix breaking unit tests
4. Fix Storybook
5. Resolve lint errors

[iamdarshshah]

Thanks for putting this together, the direction was exactly right. We shipped a function component rewrite in v7.0.0 that also introduces IntersectionObserver-based scroll detection and drops all runtime dependencies, so this is superseded.

If you'd like to keep contributing, check out the open issues or file a new one if you find something worth fixing. Looking forward to more contributions from you, let's make this the best infinite scroll library out there!