Product media

[buskamuza]

Adds support for storage configuration.
Task - https://jira.corp.magento.com/browse/ECP-95

The code is branched from 2002.0.21 version (the one being deployed by default on Cloud right now).

The storage can now be configured in STORAGE_CONFIGURATION variable from UI as following:

Azure storage example:

{
  "media": {
    "adapter": "ms_azure",
    "options": {
      "connection_string": "<azure-connection-string>",
      "container_name": "<container-name>"
    }
  }
}