GEP 1767: CORS Filter

[lianglli]

What type of PR is this?
/kind gep

What this PR does / why we need it:
This GEP proposes to add a new field HTTPCORSFilter to HTTPRouteFilter.

Which issue(s) this PR fixes:
Fixes #1767

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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[youngnick]

Thanks for the energy here @liangli, but the correct process here is for you to add some discussion about this feature to the proposed set of Experimental changes in #3403, and then, if this CORS GEP is selected for an Experimental slot by the community's voting, this PR will be able to move forward.

This is a useful feature that already has a GEP, has been discussed before, and is not too big, so it's reasonably likely that it will be included if we can free up enough Experimental slots by moving things to Standard.

I note that you added this to the 1.2 Experimental discussion as well, so it's fine to just reuse the same description in the v1.3 scoping discussion there so that any new folks will have the context to vote.

Until then, sadly, this PR will need to be on hold.

/hold