DOC: ecosystem.md: add pygwalker, add seaborn code example (#57990)

* DOC: ecosystem.md: add pygwalker, add seaborn code example

* DOC,CLN: ecosystem.md: remove EOL spaces

Co-authored-by: Matthew Roeschke <[email protected]>

---------

Co-authored-by: Matthew Roeschke <[email protected]>

Author: westurner

web/pandas/community/ecosystem.md

@@ -82,6 +82,20 @@ pd.set_option("plotting.backend", "pandas_bokeh")
 It is very similar to the matplotlib plotting backend, but provides
 interactive web-based charts and maps.
 
+### [pygwalker](https://github.com/Kanaries/pygwalker)
+
+PyGWalker is an interactive data visualization and
+exploratory data analysis tool built upon Graphic Walker
+with support for visualization, cleaning, and annotation workflows.
+
+pygwalker can save interactively created charts
+to Graphic-Walker and Vega-Lite JSON.
+
+```
+import pygwalker as pyg
+pyg.walk(df)
+```
+
 ### [seaborn](https://seaborn.pydata.org)
 
 Seaborn is a Python visualization library based on
@@ -94,6 +108,11 @@ pandas with the option to perform statistical estimation while plotting,
 aggregating across observations and visualizing the fit of statistical
 models to emphasize patterns in a dataset.
 
+```
+import seaborn as sns
+sns.set_theme()
+```
+
 ### [plotnine](https://github.com/has2k1/plotnine/)
 
 Hadley Wickham's [ggplot2](https://ggplot2.tidyverse.org/) is a