Provide dask workers volumes/volume_mounts configuration

[viniciusdc]

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
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[viniciusdc]

While this is insteresting, this can be done using the overrides, and should be enough for now, unless there is a future need for it:

Medium Worker:
      ...
      scheduler_extra_pod_config:
        volumes:
          - name: myvolume
            persistentVolumeClaim:
              claimName: my-claim
      scheduler_extra_container_config:
        volumeMounts:
          - name: myvolume
            mountPath: /tmp/extras
            subPath: tmp/extras
      worker_extra_pod_config:
        volumes:
          - name: myvolume
            persistentVolumeClaim:
              claimName: my-claim
      worker_extra_container_config:
        volumeMounts:
          - name: myvolume
            mountPath: /tmp/extras
            subPath: tmp/extras