[GH-3243] GeoPandas: Implement GeoDataFrame explode

[jiayuasu]

Did you read the Contributor Guide?

• Yes, I have read the Contributor Rules and Contributor Development Guide.

Is this PR related to a ticket?

• Yes, and the PR name follows the [GH-XXX] my subject format. Part of GeoPandas: implement distributed GeoDataFrame overlay and explode #3243.

What changes were proposed in this PR?

• Implement distributed GeoDataFrame.explode for active geometry columns using native ST_Dump and Spark posexplode expressions.
• Preserve attribute columns, index options, geometry metadata, CRS, and physical SRID, including all-empty results.
• Share the geometry-expansion implementation with GeoSeries.explode and get_coordinates without adding a join, Python row UDF, or driver collection.
• Delegate non-geometry columns to pandas-on-Spark while preserving the active geometry column.

How was this patch tested?

• Ran the targeted GeoDataFrame and GeoSeries explode tests: 25 passed, 1 skipped.
• Verified native Spark plans, multipart and collection inputs, empty/null geometries, duplicate MultiIndexes, temporary-name collisions, CRS/SRID preservation, and GeoPandas parity.
• Ran the repository commit hooks successfully.

Did this PR include necessary documentation updates?

• Yes, I have updated the English and Chinese GeoPandas API documentation.