(sagemaker-model-deployment): Support AWS Inferentia instance types

### Describe the feature

I'd like to be able to use AWS Inferentia for my endpoint inference containers

### Use Case

-

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

- [X] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

The issue names the sagemaker-model-deployment feature and AWS Inferentia endpoint inference containers, but identifies no files or tests. Start by locating the construct's instance-type configuration and existing deployment coverage. Done means an endpoint can use an Inferentia instance type with appropriate validation and tests.

Written by the indexing model from the issue text.