feat: add next_event_blocking

Hi @Arvamer! Thanks for the amazing work you're doing! I've seen your PR #86 and thought that you have a lot of other stuff to do so I might lend a hand and expose the next_event_blocking through the main lib's interface. I can't push to your branch obviously, so I've created a fork :) If you have any comments or suggestions please let me know! Thank you!

Closes #63 (closed)