refactor: try moving several utility implementations to a new package @pixiv/three-vrm-utils
#1153
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Description
Moved several utility implementations to a new package
@pixiv/three-vrm-utils
.As the README of the package says, it's mainly intended to be internal utilities.
It's a similar way to how charcoal manages its utility functions.
Also, I found several utility functions that are not referenced anywhere, so I removed them.
Points need review