Support for service account and annotation in modelSpec

[Jimmy-Newtron]

This PR enhances the model deployment by introducing support for the following deployment parameters:

• serviceAccountName: The name of the service account to use for the deployment
• annotations: The annotations to add to the deployment, e.g., {model: "opt125m"}
• podAnnotations: The annotations to add to the pod, e.g., {model: "opt125m"}

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[Jimmy-Newtron]

Hello @YuhanLiu11, I have recreated my PR rebasing and fixing the conflicts of the #429

Let me know if I can do anything else.

[rastut]

It looks like this PR is identical to my original PR #429 , including the changes, title, and description. To keep the conversation and review process in one place, I believe it would be best to continue the discussion on the original PR.