Addons: Don't expose LWO parsers.

[CodyJasonBennett]

Follow-up to #26910.

Description

I had previously exported examples/jsm/loaders/lwo, but this isn't user-facing code and dependencies of other loaders.

I'm keeping them as an implementation detail as I do examples/jsm/libs.

[WORMSS]

!!!! This makes me sad...
I was using these imports to replace part of the prototype to fix the loaders of LWO.
Since the mesh are loaded with incorrect geometry/origin positions.

[WORMSS]

Never mind, I found I can just import from the files location directly and mangle the file from there.

[CodyJasonBennett]

This only prevents access from the addons export import { IFFParser } from 'three/addons'. You can import from three/addons/* or three/examples/jsm/* as per usual -- examples/jsm/libs for instance.

[WORMSS]

I really need to get my example .lwo files sorted, so we can actually get #26733 fixed in the first place, and then wouldn't need to mangle the files at all.

Need to do the same for #26894
and also #26741 while I am at it.