Add new verbosity setting for log messages related to marshalling

- this commit adds ability to view tracing information that is emitted from `vtkDeserializer`, `vtkSerializer` and `vtkObjectManager` by configuring a log verbosity. The verbosity can be set either as an environment variable or directly on the object manager, serializer and deserializer.
- for wasm, new methods are provided in the wasm scene manager bindings. these methods let you pass in strings like "WARNING", "INFO", etc.