Support optional Parquet page index writes

## Feature Request / Improvement

PyIceberg doesn't expose Parquet page index writing, even though PyArrow supports it with `ParquetWriter(write_page_index=True)`.

### Use case / motivation

Page indexes let readers such as ClickHouse skip non-matching pages during predicate evaluation, avoiding decoding work for selective queries. Tables written by PyIceberg currently lack these indexes, so page-level pruning is not possible regardless of reader support.

### Proposed change

Add an opt-in `write.parquet.page-index-enabled` table property, default false, to preserve current output and file sizes. When enabled, PyIceberg passes `write_page_index=True` to PyArrow's ParquetWriter.

### Implementation

PR #3829 adds the table property, threads it through `_get_parquet_writer_kwargs`, documents it in mkdocs/docs/configuration.md, and includes unit and integration test coverage.

### Tooling note

I developed this with assistance from DS v4 Pro and reviewed the changes myself.

### References

- #3829

Start by reviewing PR #3829, then inspect _get_parquet_writer_kwargs, mkdocs/docs/configuration.md, and the referenced unit and integration tests. Done means the opt-in property remains false by default, enables PyArrow page-index writing when true, and the documented tests pass.

Written by the indexing model from the issue text.