feat(arguments): add WorkflowArguments object

Added a new class for WorkflowArguments. This is a special type of arguments for workflows which has
an additional field for user_data. This design will provide the option to assign user_data to a
workflow by loading them from an input file which updates the user_data information.

queenbee/schema/arguments.py

@@ -191,9 +191,6 @@ class Arguments(BaseModel):
     Queenbee accepts two types of arguments: parameters and artifacts. A ``parameter``
     is a variable that can be passed to a task or a workflow. An ``artifact`` is a file
     or folder that can be identified by a url or a path.
-
-    There is a third field for ``user_data`` which can be used to assign arbitrary values
-    to a workflow.
     """
 
     parameters: List[Parameter] = Field(
@@ -209,12 +206,6 @@ class Arguments(BaseModel):
         'task or workflow.'
     )
 
-    user_data: Dict = Field(
-        None,
-        description='Optional user data as a dictionary. User data is for user reference'
-        ' only and will not be used in the execution of the workflow.'
-    )
-
     @root_validator
     def unique_names(cls, values):
         params = values.get('parameters')
@@ -293,3 +284,16 @@ def referenced_values(self):
             ]
 
         return ref_values
+
+
+class WorkflowArguments(Arguments):
+    """A workflow arguments object.
+
+    The difference between the workflow argument and a standard argument is the extra
+    field for user_data.
+    """
+    user_data: Dict = Field(
+        None,
+        description='Optional user data as a dictionary. User data is for user reference'
+        ' only and will not be used in the execution of the workflow.'
+    )

queenbee/schema/workflow.py

@@ -11,7 +11,7 @@
 from typing import List, Union
 from queenbee.schema.qutil import BaseModel
 from queenbee.schema.dag import DAG
-from queenbee.schema.arguments import Arguments
+from queenbee.schema.arguments import Arguments, WorkflowArguments
 from queenbee.schema.operator import Operator
 from queenbee.schema.function import Function
 from queenbee.schema.artifact_location import RunFolderLocation, InputFolderLocation, \
@@ -36,7 +36,7 @@ class Workflow(BaseModel):
         description='Workflow metadata information.'
     )
 
-    inputs: Arguments = Field(
+    inputs: WorkflowArguments = Field(
         None,
         description='Workflow input arguments.'
     )