SageMaker Processing Job doesn't support FastFile Input Mode

**SageMaker Processing Job doesn't support FastFile Input Mode**
This might be the issue only for the step function, and python-sdk might provide the FastFile mode. However it doesn't make sense to me that one provides functionality and one doesn't. So, I post this issue.

According to this [document](https://sagemaker.readthedocs.io/en/stable/api/training/processing.html#sagemaker.processing.ProcessingInput), the ProcessingInput accepts FastFile mode. However If I try to create Processing Job using Step Function, error occurs.
```
"Error": "SageMaker.AmazonSageMakerException",
"Cause": "1 validation error detected: Value 'FastFile' at 'processingInputs.2.member.s3Input.s3InputMode' failed to satisfy constraint: Member must satisfy enum value set: [Pipe, File] (Service: AmazonSageMaker; Status Code: 400; Error Code: ValidationException; Request ID: 05f50214-59f0-4518-bd8e-36d800b078d0; Proxy: null)"
```
It only accepts Pipe, File.
This is related to this closed issue [#3962](https://github.com/aws/sagemaker-python-sdk/issues/3962)
And the document is updated by this PR[#4311](https://github.com/aws/sagemaker-python-sdk/pull/4311)

**Step Function Configuration**

```json
{
"ProcessingResources": {
"ClusterConfig": {
"InstanceCount": 1,
"InstanceType.$": "$.inferenceOpt.instanceType",
"VolumeSizeInGB": 100
}
},
"AppSpecification": {
"ImageUri.$": "$.inferenceOpt.imageUri",
"ContainerEntrypoint": [
"python3",
"/opt/ml/code/inference.py"
]
},
"Environment": {
"FINAL_KERNEL_SIZE.$": "$.hyperparameters.FINAL_KERNEL_SIZE",
"MODEL_ARCH.$": "$.hyperparameters.MODEL_ARCH",
"LAST_LEVEL.$": "$.hyperparameters.LAST_LEVEL",
"IMG_SIZE.$": "$.hyperparameters.IMG_SIZE",
"NUM_CLASSES.$": "$.hyperparameters.NUM_CLASSES",
"CLASS_DICT.$": "$.hyperparameters.CLASS_DICT",
"PREDICT_DATASET_ID.$": "$.hyperparameters.DATASET_ID",
"S3_PREFIX.$": "$.hyperparameters.SERVICE_NAME",
"PREDICT_ID.$": "$.hyperparameters.PREDICT_ID",
"MANIFEST_FILE.$": "$.inferenceOpt.manifestFile",
"QUEUE_URL": "https://sqs.ap-northeast-2.amazonaws.com/405240163678/Prod-Proto-CvOpsApplication-ProtoInferenceMetricQueueProtoInference-SgfJZK5ae1TV",
"REGION": "ap-northeast-2"
},
"NetworkConfig": {
"EnableNetworkIsolation": false,
"EnableInterContainerTrafficEncryption": true,
"VpcConfig": {
"SecurityGroupIds": [
"sg-0aee4467bff25504b"
],
"Subnets": [
"subnet-06dc8a4e813910a07",
"subnet-0b023fbbb320cf8d8",
"subnet-0e3b92aad033b1993"
]
}
},
"ProcessingInputs": [
{
"InputName": "model",
"S3Input": {
"S3Uri.$": "$.inferenceOpt.modelArtifact",
"LocalPath": "/opt/ml/processing/model",
"S3DataType": "S3Prefix",
"S3InputMode": "File",
"S3DataDistributionType": "FullyReplicated",
"S3CompressionType": "None"
}
},
{
"InputName": "dataset",
"S3Input": {
"S3Uri.$": "$.inferenceOpt.datastoreName",
"LocalPath": "/opt/ml/processing/manifest",
"S3DataType": "S3Prefix",
"S3InputMode": "FastFile",
"S3DataDistributionType": "FullyReplicated",
"S3CompressionType": "None"
}
},
{
"InputName": "manifest",
"S3Input": {
"S3Uri.$": "$.inferenceOpt.manifestFile",
"LocalPath": "/opt/ml/processing/config",
"S3DataType": "S3Prefix",
"S3InputMode": "File",
"S3DataDistributionType": "FullyReplicated",
"S3CompressionType": "None"
}
}
],
"RoleArn": "arn:aws:iam::405240163678:role/Prod-Proto-CvOpsApplicati-ProtoInferenceWorkflowPro-Kh3pe5GGN20F",
"ProcessingJobName.$": "States.Format('cvops-inference-{}', $$.Execution.Name)",
"Tags": [
{
"Key": "CVOps",
"Value": "Proto-CvopsInferenceTask"
}
]
}
```

**Expected behavior**
Accepting the FastFile mode, or updating the document