feat(Bar Chart): Center the segment value in a stacked bar chart, instead of at the top of the bar segment.

[carden-steven]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

I want to display each bar segment's value inside the center of the segment for a stacked bar chart.

Describe the solution you'd like

Show each bar segment's value inside the center of the bar segment, instead of at the top of the bar segment.
An optional parameter that determines whether to show the value or not would be good.

Additional context

[bb-auto]

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