[Iceberg SQL] Create cached tables with correct name

[ahmedabu98]

We used to create cached tables with the full identifier. Now we just use the table name by itself.

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Summary of Changes

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This pull request refactors the Iceberg SQL integration to standardize how tables are named within the cache. By transitioning from using full table identifiers to simple table names, the system improves consistency and avoids potential naming conflicts or redundancy in the cache lookup process. The changes include internal refactoring of name extraction logic and an updated test suite to ensure the new behavior is correctly implemented.

Highlights

• Table Naming Convention: Updated the Iceberg metastore to use simple table names instead of full identifiers when creating cached tables.
• Refactoring: Introduced a helper method tableName(String tableId) to centralize the logic for extracting simple table names from identifiers.
• Catalog Listing: Modified IcebergCatalogConfig to return full table identifiers during listing, ensuring consistency across the metastore.
• Testing: Added a new test case testGetTablesLoadsUncachedTablesWithSimpleNames to verify that tables are correctly cached and retrieved using simple names.

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Code Review

This pull request refactors table name extraction in IcebergMetastore by introducing a helper method and updates IcebergCatalogConfig to map table identifiers using toString() instead of name(). It also adds a unit test to verify loading uncached tables with simple names. The feedback suggests renaming the helper method tableName to a verb phrase like extractTableName to comply with standard Java naming conventions.

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