Add inline tag to FsStats

[RobbinBaauw]

/sig instrumentation

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Adds a JSON inline tag to VolumeStats.FsStats so generators can pick it up correctly.

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

Hi @RobbinBaauw. Thanks for your PR.

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[RobbinBaauw]

/assign @dashpole

[dashpole]

/ok-to-test
/lgtm
/approve

[dashpole]

/priority important-soon

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dashpole, RobbinBaauw

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