Add StackedBarChartOptions to exports

[chrisdudley]

StackedBarChartOptions was missing from the exports All other chart options are there except this one.

This fixes https://github.com/carbon-design-system/carbon-charts/issues/1845

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[chrisdudley]

I have read the DCO document and I hereby sign the DCO.

[chrisdudley]

PR no longer needed - changes made in another PR linked to https://github.com/carbon-design-system/carbon-charts/issues/1845