Include version info into the router package (#2456)

Signed-off-by: Ata Fatahi <immrata@gmail.com>
Co-authored-by: Byron Hsu <byronhsu1230@gmail.com>

rust/py_src/sglang_router/__init__.py

@@ -3,3 +3,9 @@ from sglang_router_rs import PolicyType
 
 # no wrapper on policy type => direct export
 from .router import Router
+
+__all__ = ["Router", "PolicyType"]
+
+from sglang_router.version import __version__
+
+__all__ += ["__version__"]

rust/py_src/sglang_router/version.py

+__version__ = "0.1.0"