Retrieve extended metadata for a file in SharePoint.
As of today, following fields are supported in the extended metadata:
size: size of the source file.
owner: display name of the owner of the source file.
full_path: pretty human readable path of the source file.
Args:
file_id (str): The ID of the file.
Returns:
dict containing the extended metadata of the file, including size, owner,
and full path.
