[SEDONA-703] Add utils for converting between RDD[Row] and SpatialRdd

[james-willis]

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?

Added utils for converting between RDD[Row] and SpatialRDD. These are helpful for usecases that back physical nodes or functions that take in and return DataFrames.

How was this patch tested?

Unit Tests

Did this PR include necessary documentation updates?

• Yes, I am adding a new API. I am using the current SNAPSHOT version number in vX.Y.Z format.

Docstrings are available.

[james-willis]

@Kontinuation @jiayuasu is this logic duplicated anywhere else? Maybe somewhere in the Join logic?