[py] Add wpimath/kinematics tests (#8461)

Used Gemini to convert the C++ tests in wpimath/.../kinematics to
pytest. For ease of use required a better constructor for
`MecanumDriveWheelPositions`

I did this conversion months ago (before robotpy landed and before the
reorg), so new tests might be missing. At least its better than nothing
🤷

Broke the huge pr that does almost everything into parts so its easier
to review.

---------

Co-authored-by: David Vo <auscompgeek@users.noreply.github.com>

wpimath/src/main/python/semiwrap/MecanumDriveWheelPositions.yml

@@ -1,5 +1,6 @@
 classes:
   wpi::math::MecanumDriveWheelPositions:
+    force_no_default_constructor: true
     attributes:
       frontLeft:
       frontRight:
@@ -8,3 +9,10 @@ classes:
     methods:
       operator==:
       Interpolate:
+    inline_code: |
+      .def(
+        py::init<
+          wpi::units::meter_t, wpi::units::meter_t, wpi::units::meter_t, wpi::units::meter_t
+        >(),
+        py::arg("frontLeft") = 0, py::arg("frontRight") = 0, py::arg("rearLeft") = 0, py::arg("rearRight") = 0
+      )