feat(experiments): add experiment runner (#1334)

Author: hassiebp

langfuse/__init__.py

@@ -1,21 +1,23 @@
 """.. include:: ../README.md"""
 
+from langfuse.experiment import Evaluation
+
 from ._client import client as _client_module
 from ._client.attributes import LangfuseOtelSpanAttributes
 from ._client.constants import ObservationTypeLiteral
 from ._client.get_client import get_client
 from ._client.observe import observe
 from ._client.span import (
-    LangfuseEvent,
-    LangfuseGeneration,
-    LangfuseSpan,
     LangfuseAgent,
-    LangfuseTool,
     LangfuseChain,
     LangfuseEmbedding,
     LangfuseEvaluator,
-    LangfuseRetriever,
+    LangfuseEvent,
+    LangfuseGeneration,
     LangfuseGuardrail,
+    LangfuseRetriever,
+    LangfuseSpan,
+    LangfuseTool,
 )
 
 Langfuse = _client_module.Langfuse
@@ -36,4 +38,7 @@
     "LangfuseEvaluator",
     "LangfuseRetriever",
     "LangfuseGuardrail",
+    "Evaluation",
+    "experiment",
+    "api",
 ]