`DataScan` `count` method does not respect limit

### Apache Iceberg version

0.9.1 (latest release)

### Please describe the bug 🐞

When calling `count()` on a `DataScan`, limit is not respected. Seems trivial but if I set a limit of 5 I expect 5 or less rows back, at least with a scan-like implementation

The underlying `ArrowScan` does not get passed the limit param

https://github.com/apache/iceberg-python/blob/main/pyiceberg/table/__init__.py#L1940

This results in scans taking longer due to not respecting the limit.

The fix will involve more than just passing the limit to the `ArrowScan`

### Willingness to contribute

- [x] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time

从 pyiceberg/table/__init__.py 第 1940 行附近开始，跟踪 DataScan.count 经过底层 ArrowScan 调用的执行路径。检查 limit 是如何传递的，并确定 issue 注释指出可能需要调整的额外扫描行为。当 count() 返回不超过请求的 limit，同时避免不必要的扫描工作时，即视为完成。

由索引模型根据 Issue 内容生成。