Update cnsvolumeinfo to hold aggregated snapshot size for pvc

[nikhilbarge]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

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Release note:

[k8s-ci-robot]

Hi @nikhilbarge. Thanks for your PR.

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[svcbot-qecnsdp]

Started vanilla Block pipeline... Build Number: 2599

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Block vanilla build status: SUCCESS 
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Block vanilla build status: FAILURE 
Stage before exit: checkout 

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Block vanilla build status: FAILURE 
Stage before exit: checkout 

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Started vanilla file pipeline... Build Number: 1152

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File vanilla build status: FAILURE 
Stage before exit: e2e-tests 

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Started vanilla Block pipeline... Build Number: 2614

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Block vanilla build status: FAILURE 
Stage before exit: e2e-tests 
Jenkins E2E Test Results: 
------------------------------

Ran 1 of 871 Specs in 406.039 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 870 Skipped
PASS

Ginkgo ran 1 suite in 7m48.382897399s
Test Suite Passed
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Ran 14 of 871 Specs in 13332.835 seconds
FAIL! -- 13 Passed | 1 Failed | 3 Flaked | 0 Pending | 857 Skipped
--- FAIL: TestE2E (13332.93s)
FAIL

Ginkgo ran 1 suite in 3h42m30.130117246s

Test Suite Failed

[svcbot-qecnsdp]

Started Vanilla block pre-checkin pipeline... Build Number: 2832

[svcbot-qecnsdp]

Build ID: 2832
Block vanilla build status: SUCCESS 
Stage before exit: e2e-tests 
Jenkins E2E Test Results: 
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Ran 0 of 871 Specs in 0.020 seconds
SUCCESS! -- 0 Passed | 0 Failed | 0 Pending | 871 Skipped
PASS

Ginkgo ran 1 suite in 1m11.830072334s
Test Suite Passed

[deepakkinni]

/milestone "Storage Quota for Snapshots"

[deepakkinni]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deepakkinni, nikhilbarge

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/vsphere-csi-driver/blob/master/OWNERS)~~ [deepakkinni] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[deepakkinni]

/lgtm

[deepakkinni]

/ok-to-test

[deepakkinni]

/lgtm