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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Release note:

NONE

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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.