X axis should be on 0 as datum

[nickofthyme]

Is your feature request related to a problem? Please describe.
I would like to make zero the point of reference for any axes if there are positive and negative values.

see https://elastic.github.io/elastic-charts/?path=/story/bar-chart--scale-to-extent

Describe the solution you'd like
The x and or y-axis lines should be on zero as datum.

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