fix: read parquet metadata after writing

[GayathriSrividya]

closes #3108

Summary

• reopen newly written parquet files and read metadata via pyarrow.parquet.read_metadata
• use the read metadata consistently when computing DataFile statistics
• add a regression test covering the write_file metadata path

Testing

• /opt/homebrew/bin/ruff format pyiceberg/io/pyarrow.py tests/io/test_pyarrow.py
• /opt/homebrew/bin/ruff check --fix pyiceberg/io/pyarrow.py tests/io/test_pyarrow.py
• PYTHONPATH=. uv run --project . pytest tests/io/test_pyarrow.py -k write_file_reads_parquet_metadata -xvs

[github-actions]

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