Unified module to access any kind of storage

[fox1t]

🚀 Feature Proposal

Plugin based storage module that abstracts the underlying storage type.

Motivation

We need a custom module that can allow us to switch between local storage(fs), s3, azure object storage and GCP storage in a seamless way. This will enable HospitalRun to run in every possibile scenario with no change to the code base.

Example

It will be used to store images,any kind of attachments and external documents.