Investigate support for async storage in controller

[amisevsk]

Description

As part of our next milestone, we need to support storage similar to asynchronous storage in Che. Hopefully, we can provision async storage in the controller itself (similar to how common storage is currently implemented). We need to investigate what work is required and implement required changes if possible.

Additional info

• workspace-data-sync repo
• async storage sidecar image
• async storage server image

[amisevsk]

Investigation done, closing in favor of #267