[FEA] Integrating models from different packages with MONAI

[vikashg]

Is your feature request related to a problem? Please describe.
We would like to bring in models made using a different platform/package like detectron2 or some other package that was not written using MONAI and deploy it using MAP.

Describe the solution you'd like
We would like an example package where it shows clearly and in a step-by-step process how to deploy models trained using packages other than MONAI.

Describe alternatives you've considered
I have used the ODK in clara to deploy similar models.

[MMelQin]

The (Clara) ODK in its core provides the utility to converts and application, in Docker image, to a Clara compliant "operator", an Docker Image itself, depending on what the original application is capable of with regard to input, output, inference logic, it may or may not need to reply on other operators (in Docker images) to provide DICOM parsing and writing capability.

We can discuss options to bring in a existing application, maybe already a Docker image itself, and what the App SDK can facilitate, bearing in mind that we had from the beginning required the MONAI Application Package to include existing external Docker image as part of the MAP.

[dbericat]

This is related to the BYO container. As soon as 0.3 is done, we have to discuss whether this goes to 0.4 or 0.5. Good challenge!