CNX-9219 CNX-9336 CNX-9218 Traversal unification + ACAD/Rhino Fallback conversion

[JR-Morgan]

CNX-9219 CNX-9336 CNX-9218

Traversal:

• Unified Traversal: GraphTraversal independent of host app
• Implemented said traversal in Rhino & Autocad

Fall-back:

• Implemented a unified ISpeckleConverterToHost
• Used right now by Autocad + Rhino (With some minor tweaks)

TODO:

• [x] Remove the Unit tests for traversal
• [x] Test Autocad
• [x] Test Rhino
• [x] Add XML docs to new stuff
• [x] Inject GraphTraversal in rhino