feat(altair): implement sunburst-basic (#5678)

## Implementation: `sunburst-basic` - python/altair

Implements the **python/altair** version of `sunburst-basic`.

**File:** `plots/sunburst-basic/implementations/python/altair.py`

**Parent Issue:** #821

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:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/anyplot/actions/runs/25347251837)*

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Markus Neusinger <2921697+MarkusNeusinger@users.noreply.github.com>

Author: github-actions[bot]

plots/sunburst-basic/implementations/python/altair.py

@@ -1,7 +1,7 @@
-""" pyplots.ai
+""" anyplot.ai
 sunburst-basic: Basic Sunburst Chart
-Library: altair 6.0.0 | Python 3.13.11
-Quality: 91/100 | Created: 2025-12-23
+Library: altair 6.1.0 | Python 3.13.13
+Quality: 82/100 | Updated: 2026-05-04
 """
 
 import altair as alt