[Py] Add default_factory in run tree (#1023)

For events.
Needed before removing core's Run subclass

python/langsmith/run_trees.py

@@ -58,6 +58,10 @@ class RunTree(ls_schemas.RunBase):
     )
     session_id: Optional[UUID] = Field(default=None, alias="project_id")
     extra: Dict = Field(default_factory=dict)
+    tags: Optional[List[str]] = Field(default_factory=list)
+    events: List[Dict] = Field(default_factory=list)
+    """List of events associated with the run, like
+    start and end events."""
     _client: Optional[Client] = None
     dotted_order: str = Field(
         default="", description="The order of the run in the tree."

python/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langsmith"
-version = "0.1.123"
+version = "0.1.124"
 description = "Client library to connect to the LangSmith LLM Tracing and Evaluation Platform."
 authors = ["LangChain <[email protected]>"]
 license = "MIT"