[WIP] feat: filesystem consistency level snapshot

[hasethuraman]

What type of PR is this?

/kind feature

What this PR does / why we need it:

By default, this CSI driver will provide file system consistency when a snapshot is taken. This PR will freeze the IOs before taking snapshot & then unfreeze post the snapshot.

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hasethuraman
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[k8s-ci-robot]

Hi @hasethuraman. Thanks for your PR.

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