Inspect the way we import .BIM

[carmenfan]

Description

I'm seeing the following structure being constructed on a navis (rvt source) plugin import:

flowchart TD
    Trans(Transform)
    Meta(Metadata)
    Mesh(Mesh)

    Trans --> Mesh
    Trans --> Meta

The metadata should also be linked up to the Mesh (otherwise we won't be able to fetch metadata for situations such as https://github.com/3drepo/3drepo.io/issues/4552):

flowchart TD
    Trans(Transform)
    Meta(Metadata)
    Mesh(Mesh)

    Trans --> Mesh
    Mesh --> Meta
    Trans --> Meta

But as there's only one mesh, the above should really be optimised into

flowchart TD    
    Meta(Metadata)
    Mesh(Mesh)

    Mesh --> Meta

Steps to replicate

• upload this file https://asitesol.sharepoint.com/:f:/s/3DRepoTeamFolder/EuK01YWuu8lGjKlhMLfLgeABtIBqvQa-A7B7oqnX8BQDiw?e=b8P5tX
• Inspect the element with id: 776839

Current Behaviour

The structure around that object is currently:

flowchart TD
    Trans(Transform)
    Meta(Metadata)
    Mesh(Mesh)

    Trans --> Mesh
    Trans --> Meta

Expected Behaviour

• The structure around this object should be:

  flowchart TD    
  Meta(Metadata)
  Mesh(Mesh)
  
  Mesh --> Meta