WIP: Migrate gengo v2

[JoelSpeed]

Working on moving our generators to the upstream WIP gengo v2 project.

Current issues I need to work through:

• Gengo v2 has no verify-only option which we rely on in deepcopy, prerelease-lifecycle generators
• OpenAPI WIP branch is not up to date with K/K PR, so cannot integrate that yet
• Pre-release lifecycle gen not integrated with codegen, it would be easier to manage if it were, very black box and only working on apps API group right now
• Have a WIP proto integration to codegen that wasn't working in non GOPATH, may work now
• Check if deepcopy etc works correctly in non-gopath

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci]

Hello @JoelSpeed! Some important instructions when contributing to openshift/api:
API design plays an important part in the user experience of OpenShift and as such API PRs are subject to a high level of scrutiny to ensure they follow our best practices. If you haven't already done so, please review the OpenShift API Conventions and ensure that your proposed changes are compliant. Following these conventions will help expedite the api review process for your PR.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoelSpeed

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[JoelSpeed]

/test verify

[openshift-merge-robot]

PR needs rebase.

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[openshift-ci]

@JoelSpeed: 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/verify	12e546a	link	true	/test verify
ci/prow/e2e-upgrade-minor	12e546a	link	true	/test e2e-upgrade-minor

Full PR test history. Your PR dashboard.

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