Consolidate methods of converting parquet file to data file builder.

[liurenjie1024]

Is your feature request related to a problem or challenge?

In #960 , we introduce another method to convert ParquetMetadata to DataFileBuilder, which has a lot duplication with this method. We should consolidate the two method, but it's block by #1004 .

Describe the solution you'd like

We only need one of them, and delegate another to it.

Willingness to contribute

• I can contribute to this feature independently
• I would be willing to contribute to this feature with guidance from the Iceberg Rust community
• I cannot contribute to this feature at this time

[mnpw]

Hi @liurenjie1024, I would like to work on this.

[jonathanc-n]

@mnpw I can help try to resolve #1004 today and you can work on this after.

[liurenjie1024]

Hi @liurenjie1024, I would like to work on this.

Thanks !

[jonathanc-n]

@mnpw This pull request should be completed by #1074. Sorry about that, the two issues were intertwined. I was only able to test the metadata conversion by completing this as well.