[code-generator] feat: add func for generating register code

[reaver-flomesh]

What type of PR is this?

/kind feature

What this PR does / why we need it:

The kube_codegen.sh of code-generator lacks function for generating register code, it'd be more convenient to provide it for users.

Which issue(s) this PR fixes:

N/A.

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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[k8s-ci-robot]

Hi @reaver-flomesh. Thanks for your PR.

I'm waiting for a kubernetes 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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[seans3]

/ok-to-test

[reaver-flomesh]

/test pull-kubernetes-integration

[cici37]

/assign @sttts
If you have time to review it. Thanks :)

/triage accepted