Download files from Azure storage under virtual directory for Multi-model serving

[leduckhc]

/kind feature

Describe the solution you'd like
I propose implementing a feature to enable the downloading of all files from Azure storage under a specified virtual directory. This enhancement would facilitate the utilization of Multi-model serving capabilities.

Anything else you would like to add:
The feature should support the downloading of files structured under a virtual directory in the following format:

azure://myStorageAccount.blob.core.windows.net/myContainer/my/Virtual/Dir/modelName

Under this structure, the files are organized as follows:

[config.pbtxt]
[<output-labels-file> ...]
<version>/
  <model-definition-file>
<version>/
  <model-definition-file>
...

Additional Notes:
This enhancement would streamline the process of retrieving files from Azure storage for multi-model serving scenarios.