feat: add delta writer for row-level changes

[DAlperin]

Which issue does this PR close?

Closes #2218

What changes are included in this PR?

This PR adds support for row-level changes (inserts, updates, and deletes) to Iceberg tables through a new DeltaWriter implementation. This enables CDC (Change Data Capture), upsert operations, and efficient row-level deletions.

Key Components:

1. RowDeltaAction Transaction (could be supplanted by feat(transaction): add RowDelta transaction action for row-level modi… #2203

   • New transaction type for applying row-level changes atomically
   • Supports both data files and delete files in a single transaction
   • Located in transaction/row_delta.rs

2. Position Delete Writer

   • Writes position delete files for efficient row-level deletions
   • Deletes rows by file path and row position
   • Located in writer/base_writer/position_delete_writer.rs

3. Delta Writer (Combined Writer)

   • Orchestrates data file, position delete, and equality delete writers
   • Intelligently routes operations based on row tracking
   • Memory-bounded row tracking with configurable limits
   • Falls back to equality deletes for older/evicted rows
   • Located in writer/combined_writer/delta_writer.rs

Input Format:
The DeltaWriter expects RecordBatch with an operations column:

• Value 1 = Insert/Update (write to data file)
• Value -1 = Delete (write to delete file)

Memory Management:

• Tracks recently written rows for efficient position deletes
• Configurable max_seen_rows limit (default: 100,000)
• FIFO eviction when limit is reached
• Can be disabled (set to 0) to use only equality deletes

Are these changes tested?

Unit tests for each new writer are added.