Add option --extra-create-metadata-prefix

[nagius]

What type of PR is this?
/kind feature

What this PR does / why we need it:
This PR add the flag --extra-create-metadata-prefix <string> to the command line.
This flag allows to select PVC annotations starting with and add them as parameter to the create request. This way we can set arbitrary information in a StatefulSet volumeClaimTemplate that will be available to the driver for each associated PV.

Example, with the flag set to --extra-create-metadata-prefix="csi.my.company.com" :

apiVersion: apps/v1
kind: StatefulSet
spec:
[...]
  volumeClaimTemplates:
  - metadata:
      name: myVolume
      annotations:
        csi.my.company.com/some_id: "1234"
        csi.my.company.com/context: "some data"

Both annotations starting with csi.my.company.com will be added as parameter to the volume request and can be use by the driver.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Add flag --extra-create-metadata-prefix

[linux-foundation-easycla]

• ✅login: nagius / (5a3f299)

The committers listed above are authorized under a signed CLA.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: nagius
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[sathieu]

@gnufied @jingxu97 Please review this PR by @nagius 🙏.