Cannot set KMS key id

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### System Information
- **Spark or PySpark**: Spark
- **SDK Version**: latest
- **Spark Version**: N/A
- **Algorithm (e.g. KMeans)**: N/A

### Describe the problem
[Endpoint configuration creation request](https://github.com/aws/sagemaker-spark/blob/0f8b920a301c29c8adbdb451563fd8cf33177f8e/sagemaker-spark-sdk/src/main/scala/com/amazonaws/services/sagemaker/sparksdk/SageMakerModel.scala#L429-L432) does not have support for KMS key id. It would be great if we can specify key id.

### Minimal repo / logs
Please provide any logs and a bare minimum reproducible test case, as this will be helpful to diagnose the problem. If including tracebacks, please include the full traceback. Large logs and files should be attached.

- **Exact command to reproduce**:

Start in sagemaker-spark-sdk/src/main/scala/com/amazonaws/services/sagemaker/sparksdk/SageMakerModel.scala around lines 429-432, where the endpoint configuration creation request is assembled. Trace the request fields and AWS SDK support for a KMS key ID; done means callers can specify the key ID when creating the endpoint configuration and the request carries it through.

Written by the indexing model from the issue text.