Add missing axel dependency to tensor_momentum (#727)

Summary:
Pull Request resolved: #727

Fix linking error when importing geometry from pymomentum PyPI package:

```
Python 3.12.11 (main, Sep  2 2025, 14:20:58) [Clang 20.1.4 ] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pymomentum.geometry
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /home/jeongseok/dev/tmp/.venv/lib/python3.12/site-packages/pymomentum/geometry.cpython-312-x86_64-linux-gnu.so: undefined symbol: _ZTVN4axel3BvhIdLm4EEE
```

This was not caught by any of the CI, which is odd but could happen with different compiler settings.

Reviewed By: cdtwigg

Differential Revision: D85474531

Author: jeongseok-meta

pymomentum/CMakeLists.txt

@@ -113,6 +113,7 @@ mt_library(
     ${ATEN_LIBRARIES}
     pybind11::pybind11
   PRIVATE_LINK_LIBRARIES
+    axel
     python_utility
     tensor_utility
     Ceres::ceres