Move snapshot validations to validation-webhook directory

[prateekpandey14]

Signed-off-by: prateekpandey14 prateekpandey14@gmail.com

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Refactor and move snapshot specific validations to pkg/validation-webhook folder

Which issue(s) this PR fixes:
Fixes #443

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @prateekpandey14. Thanks for your PR.

I'm waiting for a kubernetes-csi member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[xing-yang]

/ok-to-test

[xing-yang]

/retest

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: prateekpandey14, xing-yang

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