chore: apply pep8-naming rules for naming convention (#8261)

api/core/ops/entities/config_entity.py

@@ -26,6 +26,7 @@ class LangfuseConfig(BaseTracingConfig):
     host: str = "https://api.langfuse.com"
 
     @field_validator("host")
+    @classmethod
     def set_value(cls, v, info: ValidationInfo):
         if v is None or v == "":
             v = "https://api.langfuse.com"
@@ -45,6 +46,7 @@ class LangSmithConfig(BaseTracingConfig):
     endpoint: str = "https://api.smith.langchain.com"
 
     @field_validator("endpoint")
+    @classmethod
     def set_value(cls, v, info: ValidationInfo):
         if v is None or v == "":
             v = "https://api.smith.langchain.com"

api/core/ops/entities/trace_entity.py

@@ -15,6 +15,7 @@ class BaseTraceInfo(BaseModel):
     metadata: dict[str, Any]
 
     @field_validator("inputs", "outputs")
+    @classmethod
     def ensure_type(cls, v):
         if v is None:
             return None