design-proposal: instancetype.kubevirt.io - pkg/instancetype refactor

[lyarwood]

What this PR does / why we need it:

This isn't required at all but I wanted to write down how I think we should go about refactoring the package.

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 #

Special notes for your reviewer:

Checklist

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• Design: A design document was considered and is present (link) or not required
• PR: The PR description is expressive enough and will help future contributors
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• Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
• Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature / API change.
• Community: Announcement to kubevirt-dev was considered

Release note:

NONE

[kubevirt-bot]

Skipping CI for Draft Pull Request.
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[lyarwood]

/cc @0xFelix
/cc @akrejcir

If you have time this week would you mind giving this a once over? Writing this effort up as a design proposal is a little over the top but I thought it would be easier to discuss now instead of later in a huge PR reworking everything.

[akrejcir]

Looks good, thanks for the changes.

[kubevirt-bot]

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

Test name	Commit	Details	Required	Rerun command
pull-community-make-generate	7e913e4	link	true	/test pull-community-make-generate

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[xpivarc]

/sig compute