Enable API calls to DICOM image engines

[niwilso]

Is your feature request related to a problem? Please describe. The DicomImageRedactorEngine and DicomImagePiiVerifyEngine can be instantiated and run locally, but there is currently no support for API calls to these.

Describe the solution you'd like Allow for API calls to both DicomImageRedactorEngine and to DicomImagePiiVerifyEngine.

Describe alternatives you've considered We should double check how sensitive image data is handled by the API.

Additional context There are cases where API calls may be made just to get the bounding box information. In these cases, users would only be interested in the analyzer_results output of DicomImagePiiVerifyEngine.verify_dicom_instance() call.