Add wind barbs plot method to hvplot

[Copilot]

Adds ds.hvplot.barbs() method to support meteorological wind barb visualizations using GeoViews' WindBarbs element.

Changes

Converter (hvplot/converter.py):

• Conditional import of WindBarbs from geoviews (falls back to VectorField placeholder)
• Added 'barbs' to _kind_mapping, _kind_options, and _geo_types
• Implemented barbs() converter method supporting both Cartesian (u, v) and polar (angle, mag) wind components
• Parameter validation prevents mixing formats and ensures completeness

Plotting API (hvplot/plotting/core.py):

• Added barbs() method to hvPlotTabular with comprehensive docstring
• Registered 'barbs' in __all__ list

Tests:

• Added TestWindBarbs class with 7 test cases covering valid usage and validation errors
• Excluded 'barbs' from generic FRAME_TYPES (requires special parameters like vectorfield)

Usage

import pandas as pd
import hvplot.pandas

# Cartesian components
df.hvplot.barbs(x='lon', y='lat', u='u_wind', v='v_wind', geo=True)

# Polar components
df.hvplot.barbs(x='lon', y='lat', angle='direction', mag='speed', geo=True)

# Via kind parameter
df.hvplot(x='lon', y='lat', u='u_wind', v='v_wind', kind='barbs')

Requires geoviews package. Works with and without geographic projections.

[!WARNING]

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• https://api.github.com/repos/holoviz/geoviews/pulls/805
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Original prompt

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This section details on the original issue you should resolve

<issue_title>Add wind barbs as a method to hvplot</issue_title> <issue_description>Now that https://github.com/holoviz/geoviews/pull/805 is in, I think we can add ds.hvplot.barbs(...) to hvplot</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes holoviz/hvplot#1695

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