fix: Convert amplitude result to a complex number

[kshitijc]

Issue #, if available:

Description of changes:

• Converted amplitude result types to a complex number.
• Added integration test for validating amplitudes for SV1.
• Enabled integration tests for simulators for shots=0.

Testing done:

>>> import boto3
>>> from braket.aws import AwsDevice
>>> from braket.circuits import Circuit
>>>
>>> aws_account_id = boto3.client("sts").get_caller_identity()["Account"]
>>> c = AwsDevice("arn:aws:braket:::device/quantum-simulator/amazon/sv1")
>>> s3_folder = (f"amazon-braket-{aws_account_id}", "folder-name")
>>> c = Circuit().x(0).amplitude(state=["1"])
>>> task = device.run(c, s3_folder, shots=0)
>>> print(task.result().values[0])
{'1': (1+0j)}

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[avawang1]

There's also other conversions in here: https://github.com/aws/amazon-braket-sdk-python/blob/main/src/braket/tasks/gate_model_quantum_task_result.py#L220. These checks should probably get migrated into a function, that both from_string and this function call

[kshitijc]

Updated

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AWS CodeBuild CI Report

• CodeBuild project: SDKPullRequestBuild
• Commit ID: cfff5ea
• Result: SUCCEEDED
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