[ci] add router benchmark script and CI (#7498)

sgl-router/pyproject.toml

@@ -16,6 +16,11 @@ classifiers = [
     "Programming Language :: Python :: 3",
 ]
 
+[project.optional-dependencies]
+dev = [
+    "requests>=2.25.0",
+]
+
 # https://github.com/PyO3/setuptools-rust?tab=readme-ov-file
 [tool.setuptools.packages]
 find = { where = ["py_src"] }