Add APIs to Dataset to query and update the associated blueprint

[abey79]

Related

• Follow-up to Add UpdateDatasetEntry rpc and update DatasetEntry #10145

What

This PR introduces the following APIs to the Python SDK, related to the querying and updating of the associated blueprint dataset and default blueprint partition ID:

class Dataset:
    # …
    
    def blueprint_dataset_id(self) -> EntryId | None:
        """The ID of the associated blueprint dataset, if any."""

    def blueprint_dataset(self) -> Dataset | None:
        """The associated blueprint dataset, if any."""

    def default_blueprint_partition_id(self) -> str | None:
        """The default blueprint partition ID for this dataset, if any."""

    def set_default_blueprint_partition_id(self, partition_id: str) -> None:
        """
        Set the default blueprint partition ID for this dataset.
        This fails if the change cannot be made to the remote server.
        """

    def partition_ids(self) -> list[str]:
        """Returns a list of partitions IDs for the dataset."""

The partition_ids() helper comes as a bonus, it proved useful for the dataset loader script.

DNM: chained

[github-actions]

Web viewer built successfully. If applicable, you should also test it:

• I have tested the web viewer

Result	Commit	Link	Manifest
✅	cc1b386	https://rerun.io/viewer/pr/10156	+nightly +main

^{Note: This comment is updated whenever you push a commit.}