Include time package in codegen

[THEjacob1000]

Internal change only

This update makes it so that it'll actually include the time package import when generating the go code

Submitter Checklist

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• Self-reviewed code, removed extraneous comments, debug logging, checked code style
• No change to users after merge (off-by-default configuration, feature flag, alt URL, etc.) and can be disabled if issues arise (if this is not the case we may need stakeholder signoff)
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Reviewer Checklist

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• I am ok with code style and functionality
• I have personally tested the feature
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[smithamax]

Walking the tree a second time kind of sucks, put up #19 as a better approach