feat: Human Input Node (#32060)

The frontend and backend implementation for the human input node.

Co-authored-by: twwu <twwu@dify.ai>
Co-authored-by: JzoNg <jzongcode@gmail.com>
Co-authored-by: yyh <92089059+lyzno1@users.noreply.github.com>
Co-authored-by: zhsama <torvalds@linux.do>

api/models/__init__.py

@@ -34,6 +34,8 @@ from .enums import (
     WorkflowRunTriggeredFrom,
     WorkflowTriggerStatus,
 )
+from .execution_extra_content import ExecutionExtraContent, HumanInputContent
+from .human_input import HumanInputForm
 from .model import (
     AccountTrialAppRecord,
     ApiRequest,
@@ -155,9 +157,12 @@ __all__ = [
     "DocumentSegment",
     "Embedding",
     "EndUser",
+    "ExecutionExtraContent",
     "ExporleBanner",
     "ExternalKnowledgeApis",
     "ExternalKnowledgeBindings",
+    "HumanInputContent",
+    "HumanInputForm",
     "IconType",
     "InstalledApp",
     "InvitationCode",