Expose SMB stats as metrics

[nebula-it]

Is your feature request related to a problem?/Why is this needed

Currently, there is no way to keep an eye on the state of mounted SMB shares as CSI

Describe the solution you'd like in detail

csi-smb-node should expose the SMB metrics from /proc/fs/cifs/Stats or using smbstatus like done here

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[nebula-it]

/remove-lifecycle stale