Add PV informer and indexer

[leonardoce]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

The VolumeGroupSnapshot feature requires looking up the PV object corresponding to a volumeHandle for a known CSI Driver. At this moment, the code uses a List call on the API server, and List calls are particularly expensive.

This patch adds an informer whose lister and indexer are used to alleviate the cost of that call.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

This PR does not introduce any user-facing change nor require additional permissions. It's just a performance improvement that will avoid hitting the API server too much.

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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[jsafrane]

/lgtm
/approve

Nicely written!

Please remember to update all other PersistentVolumes().Get() in a lower prio follow up to use the informer or add a comment there why it's not possible.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jsafrane, leonardoce

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[leonardoce]

/retest

[xing-yang]

/lgtm