Walkthrough updates for development easy-of-use and RN 0.68

[apfritts]

Hi @jasongaare!

Another quick update that we're using in our app. We recently updated to RN 0.68 and some typing seemed to be off so I updated some dependencies and, as I was developing, found a few sharp edges that I hope this can help prevent other developers from running into.

There is one new feature: listening for possible outcomes while the tooltip is displayed rather than only after it is displayed. I realize now as I write this, it probably would have been better to separate that into a totally separate flag rather than reusing possibleOutcomes. Let me know your thoughts on that.

• Update some dependencies (these seemed to be required to support RN 0.68)
• Add debug option to make development easier
• Allow listening to possible outcomes while to tooltip is displayed
• Add warning for duplicate element IDs

Please let me know if there is anything you don't think belongs in here!