Enable BlockVolume support tech preview for 4.1

[j-griffith]

Add CSIBlockVolume and BlockVolume feature gates to the API. Requesting to add this for support in 4.1 in order to enable planned presentations for RH Summit. Let me know if there is a special feature exception process I need to follow.

[openshift-ci-robot]

Hi @j-griffith. Thanks for your PR.

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[deads2k]

/hold

This must be approved via the exception process including PM, architecture, and QE. This expands our test, product, and support surface area.

[eparis]

certainly a NAK on these changes. We are not going to make these available by default out of the box.

[j-griffith]

That's certainly fair, I'll remove them from the default set; there was some confusion (on my part) whether they were required to be there or not, I will remove if we can reach agreement on the remaining piece. Thanks!

[childsb]

We aren't shipping the CSI shim layers in 4.1 so there's no official CSI block support. This would only be available in-house.

Functionally this won't impact other features or be visible to customers. This is low risk +1 for the exception.

[eparis]

/hold cancel

[eparis]

/ok-to-test

[eparis]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eparis, j-griffith

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[eparis]

I believe we'll need:
https://bugzilla.redhat.com/show_bug.cgi?id=1697656
https://bugzilla.redhat.com/show_bug.cgi?id=1697657
https://bugzilla.redhat.com/show_bug.cgi?id=1697658
before this works