improve: Add more relevant snippets to the snippets panel (1/2)

[Haleshot]

📝 Summary

This PR (1/2) adds data visualization and manipulation snippets for common DS libraries; relevant issue #3602. The snippets cover Pandas (add to existing list), Polars, DuckDB, Altair (add to existing list), and Matplotlib, aiding in what I believe is common ("boilerplate") coding lines for data analysis/engineering projects/workflows in notebooks.

🔍 Description of Changes

Pandas Snippets (26-36)

Category	Snippets
Core Operations	Memory Optimization, Data Types
Data Transformation	Pivot Tables, Reshaping, Merging
Time Series	Window Operations, DateTime Features
Analysis	Groupby, Aggregations, Boolean Filtering

Key additions include memory optimization, efficient window operations, and advanced datetime handling.

Polars Snippets (0-10)

Category	Key Features
Core Operations	Lazy evaluation, joins, grouping
Performance	Memory optimization, efficient IO
Data Types	String ops, timestamps, categoricals
Analytics	Stats, window functions

Focuses on high-performance data operations with lazy evaluation patterns.

Altair Snippets (9-14)

Category	Features
Basic Charts	Scatter, bar, histogram
Interactivity	Brushing, linking, filtering
Statistical Viz	Box plots, distributions
Multi-View	Faceting, dashboards

Emphasizes interactive visualizations and statistical graphics.

Matplotlib Snippets (0-11)

Category	Components
Basic Plotting	Line, scatter, histograms
Layout	Subplots, gridspec
Styling	Themes, annotations
Scientific Viz	Error bars, 3D plots

Covers essential scientific visualization patterns.

Note: This is part 1 of 2 PRs focused on enhancing existing snippets sidebar panel.

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

📜 Reviewers

@akshayka OR @mscolnick

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[akshayka]

✂️🚀

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.11.5-dev3