[SEDONA-318] Avoid creating an unnecessary copy of raster data when serializing rasters backed by BufferedImage

[Kontinuation]

Did you read the Contributor Guide?

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

Is this PR related to a JIRA ticket?

• Yes, the URL of the associated JIRA ticket is https://issues.apache.org/jira/browse/SEDONA-318. The PR name follows the format [SEDONA-XXX] my subject.

What changes were proposed in this PR?

The current implementation of the GridCoverage2D serializer calls the getData method of the rendered image to obtain serializable raster data. When the rendered image object is a BufferedImage, it will create a hard copy of the underlying raster, which is very time-consuming. This happens when serializing rasters created by RS_MakeEmptyRaster or RS_AddBandFromArray.

This patch adds a fast path for GridCoverage2D objects backed by a BufferedImage. We call getRaster to obtain the serializable raster. This won't make a new copy of the raster data.

How was this patch tested?

Passes existing tests.

Did this PR include necessary documentation updates?

• No, this PR does not affect any public API so no need to change the docs.