[GH-3362] Move Shapefile and GeoParquet metadata readers into Spark common

[jiayuasu]

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 [GH-XXX] my subject. Closes #3362.

What changes were proposed in this PR?

Move the identical Shapefile reader and GeoParquet metadata reader implementations from the Spark 3.5, 4.0, and 4.1 modules into spark/common:

• Move 14 production Scala files and two existing test suites without changing their contents.
• Move both data-source registrations into the common service descriptor.
• Remove the duplicate versioned copies, eliminating 5,410 lines of duplicate source and test code.

Packages, public APIs, dependencies, and behavior remain unchanged. This is separate from the GeoPackage refactor in #3361; GeoPackage files are unchanged here.

How was this patch tested?

• Clean spark-shaded reactor builds for Spark 3.5 / Scala 2.12, Spark 4.0 / Scala 2.13, and Spark 4.1 / Scala 2.13:
  mvn -q clean package -pl spark-shaded -am -Dspark=<version> -Dscala=<version> -DskipTests -Dmaven.javadoc.skip=true
• Ran ShapefileTests (34 tests), GeoParquetMetadataTests (7 tests), and geoparquetIOTests (54 tests) sequentially on each Spark version. All 95 tests passed both with common-module production classes only and with the freshly built shaded JAR, for six successful runs.
• Checked each profile's artifacts: the moved classes are in the common JAR, absent from the versioned JAR, and each provider appears exactly once in the shaded service descriptor.
• Verified all moved Scala files are byte-for-byte identical to the original copies in all three Spark modules.
• Commit hooks and git diff --check passed.

Did this PR include necessary documentation updates?

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