feat: support facet plot in py-maidr using maidr-ts

[dakshpokar]

Description

Note: This doesn't support Seaborn's FacetGrid construction of the plot yet.

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

[Copilot]

Pull Request Overview

This PR introduces support for facet plots in py-maidr using the maidr-ts engine and adds several example scripts demonstrating facet plotting with both matplotlib and seaborn. Key changes include:

• New example scripts for facet plotting with matplotlib and seaborn, including combined bar and line plots.
• Updates to extractor mixins and plotting modules to improve shared label extraction and data processing for bar and line plots.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
example/facet-subplots/matplotlib/example_mpl_facet_bar_plot.py	Adds an example of a matplotlib facet bar plot
example/facet-subplots/seaborn/example_sns_facet_combined_plot.py	Adds an example of a combined seaborn facet plot for sales and profit trends
example/facet-subplots/seaborn/example_sns_facet_bar_plot.py	Implements a simple facet bar plot example using seaborn
example/facet-subplots/matplotlib/example_mpl_facet_combined_plot.py	Adds a matplotlib example combining line and bar plots in facets
maidr/util/mixin/extractor_mixin.py	Enhances tick label extraction by adding a fallback for shared x-axes
maidr/core/plot/barplot.py	Adjusts handling of bar container data and label mismatches
maidr/core/plot/maidr_plot.py	Introduces shared xlabel extraction to improve axis labeling consistency
maidr/core/plot/lineplot.py	Filters out default line labels for clearer plot annotations

Comments suppressed due to low confidence (2)

maidr/core/plot/barplot.py:71

• The commented-out length check between plot elements and their labels may mask data mismatches. Consider either removing the commented code entirely if it is no longer needed or refining the check to ensure that the number of patches always aligns with the extracted labels.

if len(plot) != len(level):

maidr/core/plot/lineplot.py:96

• Using the hardcoded string "_child0" as a filter for default labels is brittle. Consider extracting this magic string into a well-named constant to improve maintainability and clarity.

line.get_label() if line.get_label() != "_child0" else ""

[jooyoungseo]

LGTM!

[jooyoungseo]

@dakshpokar Let's merge this PR once you implement seaborn support and its example.

[dakshpokar]

Sure Professor @jooyoungseo!