Retrieves a qcs_api_client.models.InstructionSetArchitecture from the Rigetti QCS API and uses it to initialize a RigettiQCSAspenDevice.

quantum_processor_id The identifier of the Rigetti QCS quantum processor.
client Optional; A httpx.Client initialized with Rigetti QCS credentials and configuration. If not provided, qcs_api_client will initialize a configured client based on configured values in the current user's ~/.qcs directory or default values.

A RigettiQCSAspenDevice with the specified quantum processor instruction set and architecture.