feat: remove global attach/detach mutex #69
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This should increase attach/detach performance.
The previous implementation was slow when multiple volumes are attached/detached simultaneously: we locked both the attach/detach API calls and the wait for the volume to be in a terminal state.
Only the attach/detach API calls should be locked (ideally per server). Fortunately, the SDK already implements a lock on Attach and Detach operations so it should not be needed to implement it again at CSI driver level.