perf(langchain): add benchmark command (#36641)

add benchmark in Makefile

libs/langchain_v1/pyproject.toml

@@ -68,6 +68,7 @@ test = [
     "pytest-socket>=0.6.0,<1.0.0",
     "pytest-xdist<4.0.0,>=3.6.1",
     "pytest-mock",
+    "pytest-benchmark>=5.1.0,<6.0.0",
     "syrupy>=4.0.2,<6.0.0",
     "toml>=0.10.2,<1.0.0",
     "blockbuster>=1.5.26,<1.6.0",
@@ -189,6 +190,7 @@ markers = [
     "requires: mark tests as requiring a specific library",
     "scheduled: mark tests to run in scheduled testing",
     "compile: mark placeholder test used to compile integration tests without running them",
+    "benchmark: mark benchmark tests",
 ]
 asyncio_mode = "auto"
 filterwarnings = [