fix(Python bindings): add missing dependency to lanelet2

[kenji-miyake]

Description

Due to the import order change in #14, example.py is broken.

$ python3 autoware_lanelet2_extension_python/example/example.py
Traceback (most recent call last):
  File "/ws/autoware_lanelet2_extension_python/example/example.py", line 1, in <module>
    from autoware_lanelet2_extension_python.projection import MGRSProjector
  File "/ws/install/autoware_lanelet2_extension_python/local/lib/python3.10/dist-packages/autoware_lanelet2_extension_python/projection/__init__.py", line 2, in <module>
    import autoware_lanelet2_extension_python._autoware_lanelet2_extension_python_boost_python_projection as _projection_cpp
SystemError: initialization of _autoware_lanelet2_extension_python_boost_python_projection raised unreported exception

>>> from autoware_lanelet2_extension_python.projection import MGRSProjector
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/ws/install/autoware_lanelet2_extension_python/local/lib/python3.10/dist-packages/autoware_lanelet2_extension_python/projection/__init__.py", line 2, in <module>
    import autoware_lanelet2_extension_python._autoware_lanelet2_extension_python_boost_python_projection as _projection_cpp
SystemError: initialization of _autoware_lanelet2_extension_python_boost_python_projection raised unreported exception

# It should be imported after lanelet2.
>>> import lanelet2
>>> from autoware_lanelet2_extension_python.projection import MGRSProjector
# No error.

Tests performed

Tested the following steps with osrf/ros:humble-desktop.

$ vim autoware_lanelet2_extension_python/autoware_lanelet2_extension_python/projection/__init__.py # Add `import lanelet2`.
$ colcon build
$ python3
Python 3.10.12 (main, Nov 20 2023, 15:14:05) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from autoware_lanelet2_extension_python.projection import MGRSProjector
# No error.

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 19.50%. Comparing base (6fc35a0) to head (512daee).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #32   +/-   ##
=======================================
  Coverage   19.49%   19.50%           
=======================================
  Files          42       42           
  Lines        2852     2851    -1     
  Branches     1392     1391    -1     
=======================================
  Hits          556      556           
+ Misses       2296     2295    -1     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (-16.75%)	⬇️
total	19.50% <ø> (ø)		Carriedforward from 6fc35a0

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[soblin]

I will test the script with the test map later, thanks!

[soblin]

[soblin]

LGTM