feat: Initialize OpenVEX feed

[shafeeqes]

What this PR does / why we need it:
Initialize OpenVEX feed.

#SecuritySlam

Which issue(s) this PR fixes :
Fixes part of #2274

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[mrueg]

/lgtm

Thanks for your contribution!

[mrueg]

/ok-to-test

[mrueg]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mrueg, shafeeqes

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[rexagod]

Hello, @shafeeqes. Thank you for your work here!

I'm not quite sure though, what the json template is for? IIUC openvexctl can create manifests for us which can be stored in ./.openvex and attested to KSM images (however, since KSM images are generated from k8s.io, do we know if that respects (picks up) the manifests from here)?