Feat/assistant app (#2086)

Co-authored-by: chenhe <guchenhe@gmail.com>
Co-authored-by: Pascal M <11357019+perzeuss@users.noreply.github.com>

api/core/tools/utils/encoder.py

@@ -0,0 +1,21 @@
+from pydantic import BaseModel
+from enum import Enum
+from typing import List
+
+def serialize_base_model_array(l: List[BaseModel]) -> str:
+    class _BaseModel(BaseModel):
+        __root__: List[BaseModel]
+
+    """
+        {"__root__": [BaseModel, BaseModel, ...]}
+    """
+    return _BaseModel(__root__=l).json()
+
+def serialize_base_model_dict(b: dict) -> str:
+    class _BaseModel(BaseModel):
+        __root__: dict
+
+    """
+        {"__root__": {BaseModel}}
+    """
+    return _BaseModel(__root__=b).json()