Expose storage class parameters ( filesystem in particular) on csi-driver-lvm chart

Enable configurable filesystem parameter on storage classes in values.yaml on csi-driver-lvm chart.

i.e:
```
...
storageClasses:
  linear:
    parameters:
      fsType: xfs
  striped:
    parameters:
      fsType: xfs
  mirror:
    parameters:
      fsType: xfs
```