HDAViewerStateModule is similar to hou.HDAModule but dedicated for python viewer
states. It is mainly used to access the python viewer state module that
is associated with a particular digital asset type. You don’t normally need
HDAViewerStateModule for using python states though, this object is typically used by
Houdini for registering the python states embedded in the digital asset.
The python viewer state module’s source code is stored in the ViewerState Module section of the Interactive|Viewer State tab in the Type Properties dialog. The source code can be edited with the Viewer State editor.