Add owners files to subsections

[kfswain]

/kind cleanup
/kind documentation
/kind feature
/kind gep
/kind test

What this PR does / why we need it:

Adding owners to subsections of the project to give approver rights.

CC: @nirrozenbaum, @ahg-g, @liu-cong, @kaushikmitr

[k8s-ci-robot]

@kfswain: The label(s) kind/gep, kind/test cannot be applied, because the repository doesn't have them.

In response to this:

/kind cleanup
/kind documentation
/kind feature
/kind gep
/kind test

What this PR does / why we need it:

Adding owners to subsections of the project to give approver rights.

CC: @nirrozenbaum, @ahg-g, @liu-cong, @kaushikmitr

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[liu-cong]

can you add me to the scheduler root package? thanks!

[kfswain]

We are going to keep owners files scoped to specific plugins for now.

[nirrozenbaum]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kfswain, nirrozenbaum

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