[SEDONA-703] Introducing the StructuredAdapter class

[jiayuasu]

Did you read the Contributor Guide?

• Yes, I have read the 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-703. The PR name follows the format [SEDONA-XXX] my subject.

What changes were proposed in this PR?

1. Introducing the StructuredAdapter class to smooth the conversion among RDDs, DataFrames, and SpatialRDDs

The following stores InternalRow in geom.userData

• SpatialRDD to DF
• DF to SpatialRDD
• SpatialPairRDD to DF
• SpatialRDD to spatialPartitionedDF

The following stores Row in geom.userData

• SpatialRDD to RowRDD
• RowRDD to SpatialRDD

2. Deprecating the old Adapter class which relies on a string field to serialize objects
3. Introducing schema:StructType field for SpatialRDD
4. Replace all Adapter in the tutorials with StructuredAdapter to deprioritize the old Adapter class.

How was this patch tested?

Passed new unit tests

Did this PR include necessary documentation updates?

• Yes, I have updated the documentation.

[paleolimbot]

I'm new to the Spark internals here, but the partitioned part + test looks great!