[Iceberg AddFiles] Attach name-mapping to table

[ahmedabu98]

Helps engines to read legacy parquet files that don't have schema-id mapping present.

[gemini-code-assist]

Summary of Changes

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This pull request updates the Iceberg table management logic to automatically attach a name mapping to tables if one is not already defined. By forcing name-based resolution, it ensures better interoperability with legacy Parquet files that do not contain explicit schema-id mappings, thereby preventing potential read failures in downstream engines.

Highlights

• Name Mapping Integration: Added logic to ensure that a default name mapping is present in the Iceberg table properties upon table creation or loading.
• Compatibility Improvement: Enabled name-based resolution for legacy Parquet files that lack schema-id mapping, improving read compatibility for various engines.

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[chamikaramj]

Thanks. LGTM.

Let's add a test please.

[ahmedabu98]

Added to existing tests

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