feat: Add dynamic field support

This commit adds support for dynamic fields in the template field creator class. The "dynamic" attribute has been added to the class definition and its default value is set to False.

src/backend/langflow/template/field/base.py

@@ -22,6 +22,7 @@ class TemplateFieldCreator(BaseModel, ABC):
     display_name: Optional[str] = None
     advanced: bool = False
     input_types: list[str] = []
+    dynamic: bool = False
 
     def to_dict(self):
         result = self.dict()