✨ Feat: Add scripts, test, and example for bar plot

[sayalaruano]

Description

Add Bar plot to VueCore.

Tasks Checklist

• Create Pydantic schema in the vuecore/schemas folder. It should be aligned with the plotly API
• Create a script with a build function in the vuecore/engines/plotly folder
• Update theming.py script in the vuecore/engines/plotly folder
• Add the new plot in the PlotType StrEnum of the vuecore/constants.py script, and register the new builder in the __init__.py script of the vuecore/engines/plotly folder
• Create a script with the user-facing function in the vuecore/plots folder. It gathers the Pydantic schema, builder function, and saves the plot
• Create an api example jupyter notebook in the docs/api_examples folder
• Use jupytext to sync the Jupyter notebook with a Python script
• Update index.md file in the docs folder with the new example
• Create test script in the /test folder with the code from the example