feat: expose NaN values to tooltips

[markov00]

Summary

Details

Issues

close #950

Checklist

• The proper chart type label was added (e.g. :xy, :partition) if the PR involves a specific chart type
• The proper feature label was added (e.g. :interactions, :axis) if the PR involves a specific chart feature
• Whenever possible, please check if the closing issue is connected to a running GH project
• Any consumer-facing exports were added to packages/charts/src/index.ts (and stories only import from ../src except for test data & storybook)
• This was checked for cross-browser compatibility
• Proper documentation or storybook story was added for features that require explanation or tutorials
• Unit tests were updated or added to match the most common scenarios

[nickofthyme]

Is this to be closed in favor of #1226?

[markov00]

Is this to be closed in favor of #1226?

I'd like to keep this open because I've done few improvement in this PR that I like to keep