Benchmark feature fixes tests

[makungaj1]

Issue #, if available:

Description of changes:

• Unit tests
• Customize Python LRU to only cache when output is complete

Testing done:
Notebook

-- Without identity-based policy that allows the pricing:GetProducts action

jumpstart_model = JumpStartModel(model_id="meta-textgeneration-llama-3-70b")
jumpstart_model.list_deployment_configs()

Instance rate metrics will be omitted. Reason: User: arn:aws:sts::312206380606:assumed-role/AmazonSageMaker-ExecutionRole-20230707T131628/SageMaker is not authorized to perform: pricing:GetProducts because no identity-based policy allows the pricing:GetProducts action
[{'DeploymentConfigName': 'tgi',
  'DeploymentArgs': {'ImageUri': '875423407011.dkr.ecr.us-west-2.amazonaws.com/suzuka-beta:djl-serving-v3.2',
   'ModelData': {'S3DataSource': {'S3Uri': 's3://jumpstart-private-cache-prod-us-west-2/meta-textgeneration/meta-textgeneration-llama-3-70b/artifacts/inference-prepack/v1.0.0/',
     'S3DataType': 'S3Prefix',
     'CompressionType': 'None'}},
   'Environment': {'SAGEMAKER_PROGRAM': 'inference.py',
    'ENDPOINT_SERVER_TIMEOUT': '3600',
    'MODEL_CACHE_ROOT': '/opt/ml/model',
    'SAGEMAKER_ENV': '1',
    'HF_MODEL_ID': '/opt/ml/model',
    'SERVING_LOAD_MODELS': 'test::MPI=/opt/ml/model',
    'OPTION_MODEL_ID': '/opt/ml/model',
    'OPTION_SPECULATIVE_DRAFT_MODEL': 'sagemaker',
    'OPTION_TENSOR_PARALLEL_DEGREE': 'max',
    'OPTION_MAX_ROLLING_BATCH_SIZE': '64',
    'OPTION_ROLLING_BATCH': 'lmi-dist',
    'OPTION_GPU_MEMORY_UTILIZATION': '0.85',
    'SAGEMAKER_MODEL_SERVER_WORKERS': '1'},
   'InstanceType': 'ml.p4d.24xlarge',
   'ComputeResourceRequirements': {'MinMemoryRequiredInMb': 589824,
    'NumberOfAcceleratorDevicesRequired': 8},
   'ModelDataDownloadTimeout': 1200,
   'ContainerStartupHealthCheckTimeout': 1200},
  'AccelerationConfigs': None,
  'BenchmarkMetrics': None},
 {'DeploymentConfigName': 'lmi',
  'DeploymentArgs': {'ImageUri': '875423407011.dkr.ecr.us-west-2.amazonaws.com/suzuka-beta:djl-serving-v3.2',
   'ModelData': {'S3DataSource': {'S3Uri': 's3://jumpstart-private-cache-prod-us-west-2/meta-textgeneration/meta-textgeneration-llama-3-70b/artifacts/inference-prepack/v1.0.0/',
     'S3DataType': 'S3Prefix',
     'CompressionType': 'None'}},
   'Environment': {'SAGEMAKER_PROGRAM': 'inference.py',
    'ENDPOINT_SERVER_TIMEOUT': '3600',
    'MODEL_CACHE_ROOT': '/opt/ml/model',
    'SAGEMAKER_ENV': '1',
    'HF_MODEL_ID': '/opt/ml/model',
    'SERVING_LOAD_MODELS': 'test::MPI=/opt/ml/model',
    'OPTION_MODEL_ID': '/opt/ml/model',
    'OPTION_SPECULATIVE_DRAFT_MODEL': 'sagemaker',
    'OPTION_TENSOR_PARALLEL_DEGREE': 'max',
    'OPTION_MAX_ROLLING_BATCH_SIZE': '64',
    'OPTION_ROLLING_BATCH': 'lmi-dist',
    'OPTION_GPU_MEMORY_UTILIZATION': '0.85',
    'SAGEMAKER_MODEL_SERVER_WORKERS': '1'},
   'InstanceType': 'ml.p4d.24xlarge',
   'ComputeResourceRequirements': {'MinMemoryRequiredInMb': 589824,
    'NumberOfAcceleratorDevicesRequired': 8},
   'ModelDataDownloadTimeout': 1200,
   'ContainerStartupHealthCheckTimeout': 1200},
  'AccelerationConfigs': None,
  'BenchmarkMetrics': {'ml.p4d.24xlarge': [{'name': 'Min Latency',
     'value': '26',
     'unit': 'ms/token'},
    {'name': 'Max Throughput', 'value': '983', 'unit': 'tokens/sec'},
    {'name': 'Max Concurrency', 'value': '256', 'unit': 'count'}]}},
 {'DeploymentConfigName': 'lmi-accelerated',
  'DeploymentArgs': {'ImageUri': '875423407011.dkr.ecr.us-west-2.amazonaws.com/suzuka-beta:djl-serving-v3.2',
   'ModelData': {'S3DataSource': {'S3Uri': 's3://jumpstart-private-cache-prod-us-west-2/meta-textgeneration/meta-textgeneration-llama-3-70b/artifacts/inference-prepack/v1.0.0/',
     'S3DataType': 'S3Prefix',
     'CompressionType': 'None'}},
   'Environment': {'SAGEMAKER_PROGRAM': 'inference.py',
    'ENDPOINT_SERVER_TIMEOUT': '3600',
    'MODEL_CACHE_ROOT': '/opt/ml/model',
    'SAGEMAKER_ENV': '1',
    'HF_MODEL_ID': '/opt/ml/model',
    'SERVING_LOAD_MODELS': 'test::MPI=/opt/ml/model',
    'OPTION_MODEL_ID': '/opt/ml/model',
    'OPTION_SPECULATIVE_DRAFT_MODEL': 'sagemaker',
    'OPTION_TENSOR_PARALLEL_DEGREE': 'max',
    'OPTION_MAX_ROLLING_BATCH_SIZE': '64',
    'OPTION_ROLLING_BATCH': 'lmi-dist',
    'OPTION_GPU_MEMORY_UTILIZATION': '0.85',
    'SAGEMAKER_MODEL_SERVER_WORKERS': '1'},
   'InstanceType': 'ml.p4d.24xlarge',
   'ComputeResourceRequirements': {'MinMemoryRequiredInMb': 589824,
    'NumberOfAcceleratorDevicesRequired': 8},
   'ModelDataDownloadTimeout': 1200,
   'ContainerStartupHealthCheckTimeout': 1200},
  'AccelerationConfigs': None,
  'BenchmarkMetrics': {'ml.p4d.24xlarge': [{'name': 'Min Latency',
     'value': '10',
     'unit': 'ms/token'},
    {'name': 'Max Throughput', 'value': '635', 'unit': 'tokens/sec'},
    {'name': 'Max Concurrency', 'value': '64', 'unit': 'count'}]}}]

jumpstart_model.display_benchmark_metrics()

Instance rate metrics will be omitted. Reason: User: arn:aws:sts::312206380606:assumed-role/AmazonSageMaker-ExecutionRole-20230707T131628/SageMaker is not authorized to perform: pricing:GetProducts because no identity-based policy allows the pricing:GetProducts action
| Instance Type             | Config Name     |   Min Latency (ms/token) |   Max Throughput (tokens/sec) |   Max Concurrency (count) |
|:--------------------------|:----------------|-------------------------:|------------------------------:|--------------------------:|
| ml.g5.48xlarge            | lmi             |                       57 |                            60 |                         8 |
| ml.p4d.24xlarge           | lmi             |                       26 |                           983 |                       256 |
| ml.g5.48xlarge            | lmi-accelerated |                       33 |                            43 |                         8 |
| ml.p4d.24xlarge (Default) | lmi-accelerated |                       10 |                           635 |                        64 |

-- With identity-based policy that allows the pricing:GetProducts action: No need to reboot the kernel, the output will be cached so future requests can use.

NOTE: After adding the policy, need to give it at least 10 seconds to propagate.

jumpstart_model.display_benchmark_metrics()

| Instance Type             | Config Name     |   Min Latency (ms/token) |   Max Throughput (tokens/sec) |   Max Concurrency (count) |   Instance Rate (USD/Hrs) |
|:--------------------------|:----------------|-------------------------:|------------------------------:|--------------------------:|--------------------------:|
| ml.g5.48xlarge            | lmi             |                       57 |                            60 |                         8 |                     20.36 |
| ml.p4d.24xlarge           | lmi             |                       26 |                           983 |                       256 |                     38.67 |
| ml.g5.48xlarge            | lmi-accelerated |                       33 |                            43 |                         8 |                     20.36 |
| ml.p4d.24xlarge (Default) | lmi-accelerated |                       10 |                           635 |                        64 |                     38.67 |

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• [x ] I have added tests that prove my fix is effective or that my feature works (if appropriate)
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