Process delete files when writing snapshots

### Is your feature request related to a problem or challenge?

Currently we don't have a way of generating delete file content when writing new snapshots. This will prevent us from implementing rewrite or delete transactions

### Describe the solution you'd like

A working version can be found here: https://github.com/apache/iceberg-rust/pull/1606/changes#diff-de4cef928aa029fb345044390081b5998c99c52e320a4046579c457c3b03a507

### Willingness to contribute

I can contribute to this feature independently

The issue names no source files or tests. Start by reading the referenced iceberg-rust PR diff, then trace the snapshot-writing path to identify where delete file content should be generated. Done means a working implementation that supports the rewrite or delete transactions described in the issue.

Written by the indexing model from the issue text.