DVX-398: Removed the required kwarg (name) from the DataContract creator()

[Aryamanz29]

• Updated creator() to use the Atlan CLI approach to construct the DataContract name.

Sample snippet:

from json import dumps
from pyatlan.client.atlan import AtlanClient
from pyatlan.model.assets import DataContract
from pyatlan.model.enums import CertificateStatus

contract_json = {
    "type": table.type_name,
    "status": CertificateStatus.DRAFT,
    "kind": "DataContract",
    "data_source": connection.name,
    "dataset": table.name,
    "description": "Automated testing of the Python SDK.",
}

contract = DataContract.creator(
    asset_qualified_name=table.qualified_name,
    contract_json=dumps(contract_json),
)

response = client.asset.save(contract)