[SEDONA-500] Fix failures and data consistency problems when reading multiple shapefiles in one directory

[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-500. The PR name follows the format [SEDONA-XXX] my subject.

What changes were proposed in this PR?

Fix problems when generating splits for directories containing multiple shapefiles. This fixes the following issues:

1. Reading fails with errors such as "shape record loses attributes in .dbf file at ID=2387"
2. Geometry values and other fields do not match.
3. Not all records were read into SpatialRDD

How was this patch tested?

Add additional assertion to the testReadMultipleShapeFilesByMultiPartitions test case.

Did this PR include necessary documentation updates?

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