Add state field to ResyncVolumeResponse

Add state file to the ResyncVolumeResponse to provide more clarity about the current state of the volume

```go
message ResyncVolumeResponse{
// Indicates that the volume is ready to use.
// The default value is false.
// This field is REQUIRED.
bool ready = 1;
// Represents the current state of the volume which is helpful to provide the state of the volume to the user.
// with this user can identify that the image is still resyncing, completed, stated to resync, or failed to resync.
string state =2;
}
```