Add subsetting logic for epp

[rlakhtakia]

Issue: #415
Proposal

Add subsetting filter to ensure EPP only selects from the list of endpoints passed in through request metadata.

Changes:

• Filter logic + unit test + integration test
• Update request type to pass in metadata context
• Update scheduler profiles to use filter

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[k8s-ci-robot]

Hi @rlakhtakia. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nirrozenbaum]

envoy specifics should be only in the server.go.
rest of the code should work with go general structs like maps

[nirrozenbaum]

/ok-to-test

[kfswain]

just a couple comments to future proof us! otherwise lgtm

[kfswain]

/retest

[rlakhtakia]

/retest

[liu-cong]

just a few nits

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

@rlakhtakia: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gateway-api-inference-extension-test-unit-main	bf23e35	link	true	/test pull-gateway-api-inference-extension-test-unit-main

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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