[Umbrella] Subissue Improve row.* test coverage

### Search before asking

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

### Description

Currently, we ignore a lot of classes to make the code coverage pass. We need to add unit tests or integration tests around those classes to improve the coverage.
In this issue, it aims to cover com.alibaba.fluss.row.* to increase the coverage.

More specifically, there are currently the following classes that need to have their test coverage improved. You can split the work into multiple commits:

```
com.alibaba.fluss.utils.concurrent.FutureUtils.Timeout
com.alibaba.fluss.row.BinarySection
com.alibaba.fluss.row.arrow.*
com.alibaba.fluss.row.columnar.BytesColumnVector.Bytes
com.alibaba.fluss.row.columnar.VectorizedColumnBatch
com.alibaba.fluss.row.encode.RowEncoder
```

### Willingness to contribute

- [ ] I'm willing to submit a PR!