[Feature] Support Lance file format

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/paimon-cpp/issues) and found nothing similar.

### Motivation

Apache Paimon Java supports Lance as a data file format through the paimon-lance module. Paimon C++ currently cannot read or write tables configured with file.format=lance, which prevents Java and C++ engines from interoperating on those tables.

### Solution

Add optional Lance file format support to Paimon C++, aligned with the Java implementation and Lance 0.39.0:

- register a Lance file format factory behind a disabled-by-default CMake option;
- support reading and writing Lance files through the existing file format interfaces;
- support column projection, precise row selection, row counts, and file row-id reporting;
- validate the same supported and unsupported logical types as Java;
- add C++ round-trip tests and Java/C++ compatibility fixtures in both directions.

The implementation should follow the existing Mosaic Rust FFI integration and lifecycle patterns.

### Anything else?

Java reference module: https://github.com/apache/paimon/tree/master/paimon-lance

### Are you willing to submit a PR?

- [x] I am willing to submit a PR!

先閱讀現有的 Mosaic Rust FFI 整合與生命週期模式，接著比較 paimon-lance 中的 Java 參考模組，並檢查現有的檔案格式介面。完成的標準是：一個預設停用的選用 CMake 整合支援 Lance 的讀取與寫入、必要的投影與列選取、列中繼資料、邏輯型別驗證、往返測試，以及 Java/C++ 相容性 fixtures。

由索引模型根據 Issue 內容生成。