Adding fs_group_policy field for kubernetes_csi_driver

[sharon-raphael]

Description

PR fixes #2702

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

Adding `fs_group_policy` field for `kubernetes_csi_driver` resource.

References

https://kubernetes-csi.github.io/docs/csi-driver-object.html

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