[SEDONA-756] feat: raster Python serde and with_bands() support

[prantogg]

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 format [SEDONA-XXX] my subject.

What changes were proposed in this PR?

Returning raster data from Python UDFs currently requires .tolist() + RS_MakeRaster, which forces Float64 promotion, creates 262K Python float objects per 512×512 tile, and loses all raster metadata (CRS, nodata, affine transform).

This PR adds:

• raster_serde.serialize() — Writes InDbSedonaRaster to Sedona's binary format, byte-compatible with JVM Serde.deserialize(). Uses cache-and-replay for opaque Kryo blobs (categories, properties, colorModel).
• InDbSedonaRaster.with_bands() — Creates a new raster with replaced pixel data (NumPy array) but preserved spatial metadata. Band count and dtype may differ from the source.
• RasterType.serialize() — Delegates to raster_serde.serialize() instead of raising NotImplementedError.
• DeepCopiedRenderedImage.reconcileColorModel() (JVM) — Fixes colorModel/sampleModel mismatches at deserialization time when Python UDFs change band count or dtype.
• KryoUtil.skipUTF8String() and GridSampleDimensionSerializer.skip() — Utility methods for navigating Kryo streams without full deserialization.

Benchmarked on Apple M2 Pro, 4-band rasters, median of 50 iterations:

Tile Size	Old .tolist() (ms)	New serialize() (ms)	Speedup	Old mem (KB)	New mem (KB)	Mem ratio
64×64	0.16	0.04	3.6×	384	66	5.8×
256×256	2.56	0.11	23×	6,144	1,026	6×
512×512	11.63	0.66	18×	24,576	4,098	6×

How was this patch tested?

• 8 with_bands() tests (band count changes, dtype changes, metadata survival)
• 2 serialize round-trip tests
• 1 JVM serde test (colorModel mismatch handling)
• Passes all existing tests

Did this PR include necessary documentation updates?

• Yes, updated the "Writing Python UDF" section in docs/tutorial/raster.md to show the new raster-to-raster UDF pattern using with_bands().

[jiayuasu]

Hi @prantogg — heads up, I rebased this branch onto current master to resolve the conflict in docs/tutorial/raster.md that surfaced after #2954 merged. New head: c52c18ae2f (your authorship preserved).

Resolution choices for the UDF section:

• Kept the new ### Raster to scalar / ### Raster to raster split, the with_bands() example, and the in-db/out-db warning admonition from your PR.
• Dropped the old "returning a raster isn't supported, use RS_MakeRaster workaround" paragraph that [GH-2804] Raster tutorial: end-to-end running example with visuals #2954's rewrite was still carrying — now obsolete with with_bands().
• Kept the rewrite's ## Performance heading instead of reverting to ## Performance optimization, since the rename was unrelated to this feature.
• Removed a misleading [SedonaRaster.with_bands()] link that pointed to RS_MakeRaster.md; with_bands() is a Python method, not a SQL function with its own page.
• Mirrored the same edits in docs/tutorial/raster.zh.md (which [GH-2804] Raster tutorial: end-to-end running example with visuals #2954 added and was previously out of sync with the English content).

If you have local commits on top of pranav/feature/raster-python-serde you'll need to git fetch && git reset --hard origin/pranav/feature/raster-python-serde (or rebase your local work onto the new tip) before continuing. Sorry for the force-push.

[jiayuasu]

Please remove references to outdb since they don't exist here

[prantogg]

Done — the rebase you did already removed these references. Confirmed there are no remaining out-db mentions in the current branch.