Implement OpenShift Route creation for InferenceGraphs

[israel-hdez]

What this PR does / why we need it:

InferenceGraphs doesn't have any ingress reconciler. Despite that, in ODH we need a mechanism to expose InferenceGraphs. This implements exposing InferenceGraphs on OpenShift using Routes.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes https://issues.redhat.com/browse/RHOAIENG-17831

Type of changes
Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Feature/Issue validation/testing:

• Create InferenceGraph in Raw mode. Then, check that a route is created and accessible.
  • Delete the created Route. Check that the controller restores it.
  • Delete the InferenceGraph. Check that the Route is deleted.

Checklist:

• Have you added unit/e2e tests that prove your fix is effective or that this feature works?
• [ x Has code been commented, particularly in hard-to-understand areas?
• [N/A] Have you made corresponding changes to the documentation?

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: israel-hdez

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[openshift-ci]

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

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-fast	ec7272e	link	true	/test e2e-fast
ci/prow/e2e-slow	ec7272e	link	true	/test e2e-slow
ci/prow/e2e-raw	ec7272e	link	true	/test e2e-raw

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[Jooho]

This looks good to me. the code does not impact existing code because it is additional logic to create a route. so I don't think we need e2e test for this.
/lgtm