Update NotebookMetadata.metadata to an appropriate type

[santhoshramaraj]

NotebookMetadata.metadata is typed as Dict[str,Any] whereas there are a few standard fields documented by the example provided in the swagger docs.

nisystemlink-clients-python/nisystemlink/clients/notebook/models/_notebook_metadata.py

Line 34 in 4a965b4

metadata: Optional[Dict[str, Any]]

OrderedMap { 
	"interfaces": List [ "interface" ], 
	"outputs": List [ 
		OrderedMap { 
			"display_name": "Output", 
			"id": "output", 
			"type": "scalar" 
			} ], 
	"parameters": List [
		OrderedMap { 
			"display_name": "Parameter1",
			"id": "parameter1",
			"type": "string" },
			OrderedMap {
				"display_name": "Parameter2",
				"id": "parameter2",
				"type": "string[]" 
				} ] 
			}

Developer experience will improve if the metadata field is properly modeled to depict the default optional fields instead of a generic type.