Storage Abstraction Layer - Local FS

[mocsharp]

Is your feature request related to a problem? Please describe.
As the MONAI Deploy Platform utilizes shared storage that could be on a local files system, a mounted volume, a NAS device, or a cloud storage service. MIS needs an abstraction layer defined that allows users to configure the storage that fits their needs or to extend the APIs for other storage services.

Describe the solution you'd like
Define an abstraction layer as described in the SRS and implement the default storage access using local FS. This default option supports local FS, docker mounted volume, and any volume accessible with the local file scheme.

Describe alternatives you've considered
Direct access to the storage layer may not be extensible and therefore we are adding an abstraction layer.

[mocsharp]

Assuming we are using https://min.io/ for both on-prem and cloud deployments.