Add `delete_files`

### Feature Request / Improvement

Hello All,

First of all, apologies as I am not very experienced with PyIceberg.

I currently have a Java application that "manually" updates table metadata and can add new files if they don't exist and replace older files if they already do. This guarantees that, as long as the file names are fixed, I should not have duplicates.

In Java, I use [deleteFile](https://iceberg.apache.org/javadoc/0.13.1/org/apache/iceberg/DeleteFiles.html#deleteFile-java.lang.CharSequence-) and then [addFile](https://iceberg.apache.org/javadoc/0.13.1/org/apache/iceberg/OverwriteFiles.html#addFile-org.apache.iceberg.DataFile-).

In PyIceberg, I can [Add Files](https://py.iceberg.apache.org/api/#add-files), but I don't see options to "Delete Files" or overwrite.

Is `delete_files()` a feature that you could add?

Beginne mit der bestehenden Add Files API von PyIceberg und vergleiche ihr Verhalten mit den verlinkten Java DeleteFiles- und OverwriteFiles-APIs. Definiere die unterstützten delete_files- oder overwrite-Semantiken und überprüfe, dass die fertiggestellte Funktion es Aufrufern ermöglicht, vorhandene Datendateien zu entfernen oder zu ersetzen, ohne Duplikate zu erstellen.

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