use LegendList reportContentInset

[jmeistrich]

• update LegendList to 3.0.0-beta.22 which has a reportContentInset function
• remove the workarounds setting contentInset in JS, and just reportContentInset when it changes from native

[vercel]

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[vercel]

Additional Suggestion:

The legendListRef is never passed to the LegendList component, causing reportContentInset to never be called.

[nandorojo]

@jmeistrich mind retroactively signing all the commits here?

Instructions:

1. Ensure you have a local copy of your branch by checking out the pull request locally via command line.
2. In your local branch, run: git rebase HEAD~1 --signoff
3. Force push your changes to overwrite the branch: git push --force-with-lease origin f/ll-reportContentInset