[Feat]: get_data_parts as part of utils

[andrewn3]

Is your feature request related to a problem? Please describe.

in message.py under utils there is a get_text_parts() but no equivalent function for data e.g. get_data_parts()

Describe the solution you'd like

e.g.

def get_data_parts(parts: list[Part]) -> list[dict[str, Any]]:
    """Extracts dictionary data from all DataPart objects in a list of Parts.

    Args:
        parts: A list of `Part` objects from a message.

    Returns:
        A list of dictionaries containing the data from any `DataPart` objects found.
    """
    # This line is the key: it looks for DataPart and gets the .data attribute
    return [part.root.data for part in parts if isinstance(part.root, DataPart)]

Describe alternatives you've considered

obviously write an maintain my own function, but if the message structure changes best if it's part of the library.

Additional context

No response

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