feat: expose base scoped store bindings to python

[zhangyue19921010]

Tested: Python can write to different S3 buckets within the same multi-base dataset, using different storage configs for each base.configs.

from pathlib import Path
import shutil

import lance
import pyarrow as pa
from lance import DatasetBasePath


def main():
    path0 = "s3://ceshi/las/lance/multi-base-write2"
    path1 = "s3://zy-test-lance/zy-test-lance/multi-base-write2/"

    storage_options_0 = {
        "access_key_id": "",
        "secret_access_key": "==",
        "aws_endpoint": "",
        "aws_region": "",
        "virtual_hosted_style_request": "true",
    }

    storage_options_1 = {
        "access_key_id": "",
        "secret_access_key": "==",
        "aws_region": "",
        "aws_endpoint": "",
        "virtual_hosted_style_request": "true"
    }

    base_store_params = {
        path1: storage_options_1,
    }

    local_rows = pa.Table.from_pylist(
        [
            {"name": "Alice", "age": 20},
            {"name": "Jack", "age": 20},
        ]
    )

    s3_rows = pa.Table.from_pylist(
        [
            {"name": "Bob", "age": 30},
        ]
    )

    ds = lance.write_dataset(
        local_rows,
        path0,
        mode="create",
        initial_bases=[
            DatasetBasePath(path0, name="s3", is_dataset_root=True),
            DatasetBasePath(path1, name="s3"),
        ],
        target_bases=["s3"],
        base_store_params=base_store_params,
        storage_options=storage_options_0,
    )

    ds = lance.write_dataset(
        s3_rows,
        ds,
        mode="append",
        target_bases=["s3"],
        base_store_params=base_store_params,
        storage_options=storage_options_0,
    )


if __name__ == "__main__":
    main()