Automatic merge from submit-queue (batch tested with PRs 62982, 63075, 63067, 62877, 63141). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

eliminate indirection from type registration

Some years back there was a partial attempt to revamp api type registration, but the effort was never completed and this was before we started splitting schemes. With separate schemes, the idea of partial registration no longer makes sense.  This pull starts removing cruft from the registration process and pulls out a layer of indirection that isn't needed.

@kubernetes/sig-api-machinery-pr-reviews 
@lavalamp @cheftako @sttts @smarterclayton 

Rebase cost is fairly high, so I'd like to avoid this lingering.

/assign @sttts 
/assign @cheftako 

```release-note
NONE
```