Add Cost Tracker Support for AwsQuantumJobs

[ldi18]

The costs of a quantum task can be constrained by:

device = AwsDevice("arn:aws:braket:us-west-1::device/qpu/rigetti/Ankaa-2")
with Tracker() as tracker:
    while tracker.qpu_tasks_cost() < 1:
        result = device.run(circ, shots=200).result()
print(tracker.quantum_tasks_statistics())
print(tracker.qpu_tasks_cost(), "USD")

As far as I know, there is no equivalent for AwsQuantumJobs yet. It would be nice to have a feature added so that a cost threshold for AwsQuantumJobs can be set either by:

with Tracker() as tracker:
    while tracker.qpu_tasks_cost() < 1:
          job = AwsQuantumJob.create(
              device="arn:aws:braket:::device/quantum-simulator/amazon/sv1",
              source_module="src",
              entry_point="src.test_code:run",
              hyperparameters={},
              job_name=f"job1",
          )
print(tracker.quantum_tasks_statistics())
print(tracker.qpu_tasks_cost(), "USD")

or by adding another parameter to the .create() method.

[speller26]

One way to track cost is to make use of job CloudWatch metrics; you can use the cost tracker inside your job code and emit metrics from there. However, to use the tracker locally would require some changes to the service.