Add docs for reading iceberg tables

[furqaankhan]

We don't have any docs on how to read Iceberg tables into Sedona. The Iceberg can be hosted anywhere, either in the Glue catalog or the Unity catalog.

Things to add:

1. Configuration to set up to connect to catalogs (glue or unity). Either is fine as a starting point.
2. Examples on how to read Iceberg tables once it is connected, with this syntax:

sedona.read.format("iceberg").load("catalog_name.schema_name.table_name")

[github-actions[bot]]

Thank you for your interest in Apache Sedona! We appreciate you opening your first issue. Contributions like yours help make Apache Sedona better.