fix: address an issue where stacked bar plot doesn't work

[dakshpokar]

Description

This PR fixes the issue with stacked bar plot in pymaidr. Also it solves the problem where user had to create the object of stacked bar plot and then pass it to the function maidr.stacked(). Now with this change user will not need to pass the plot object to maidr.stacked(plot) instead they can directly call maidr.show(plot) like we do it for the other plots.

closes #82

Type of Change

• Bug fix
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[dakshpokar]

Greetings Professor @jooyoungseo & @SaaiVenkat,
This pull request resolves the issue with the stacked bar plot by implementing a minor patch to the bar function. Consequently, the previous requirement to create a separate object for the stacked bar plot and subsequently invoke interactivity via the maidr.stacked method has been eliminated. We can now directly call maidr.show(plot) in the same manner as with other plot types.

Please note that this pull request does not address the highlighting issue. The highlight feature in PyMaidr was introduced in this pull request. To fully resolve the highlighting functionality for stacked bar plots, we will need to develop a more generic solution. Currently, the desired elements are extracted by adding the attribute maidr="true" in the SVG; however, a more universal approach is necessary to extend this functionality across similar plots.
I will be creating a separate issue for this as we need to support highlight issue for not just segmented plots like stacked bar plot but also for box plot.

Thanks,
Daksh Pokar