Proposal: Use Rclone's FS Interface for Object Store Layer

The project contains implementations for object store providers. I want to propose an alternative to that by using Rclone's [FS](https://pkg.go.dev/github.com/rclone/rclone/fs?tab=doc#Fs) interface. Rclone has implementations for several [providers](https://rclone.org/#providers) and so by using that UtahFS can immediately support multiple providers. A simple wrapper around Rclone's FS can be implemented which satisfies the ObjectStore interface internally.

As far as I understood, Object Layer is simple Getters and Setters and since all of the additional security is implemented by above layers, a third party implementation should suffice. But I might be wrong here.

Disclaimer: I'm not in anyway associated with Rclone project.