Refractor codebase (internal,cmd package only)

currently, it's difficult to write a Unit testing for the current code base, if we move all cephfs and rbd and rados function to a new interface and methods it will allow us to mock the things are helping us to write the unit testing for the current codebase

the functions which can be moved to the different interfaces and to seperate files also example
```
GetOMapValue()
getImageInfo()
createImage()
deleteImage()
etc...
```