[SPARK-45654][PYTHON] Add Python data source write API

[allisonwang-db]

What changes were proposed in this pull request?

This PR adds Python data source write API and DataSourceWriter class datasource.py.

Here is an overview of writer class:

class DataSourceWriter(ABC):
    @abstractmethod
    def write(self, iterator: Iterator[Row]) -> Any:
        ...
    
    def commit(self, messages: List[Any]) -> None:
        ...
    
    def abort(self, messages: List[Any]) -> None:
        ...

Why are the changes needed?

To support Python data source write.

Does this PR introduce any user-facing change?

No. This PR alone does not introduce any user-facing change.

How was this patch tested?

Unit test

Was this patch authored or co-authored using generative AI tooling?

No

[HyukjinKwon]

Let's add @since 4.0.0

[HyukjinKwon]

@allisonwang-db mind resolving conflicts please?

[HyukjinKwon]

Merged to master.