feat(lanelet2_map_validator): generation script for new validators

[TaikiYamada4]

Description

This PR adds a tool to autoware_lanelet2_map_validator that can generate necessary files to create a new validator which will be useful to contributors.

This PR does the following.

• Create a template directory and add templates for documents and test codes.
• Move validator_template.cpp and validator_template.hpp to template
• Create a python script create_new_validator.py that can generate necessary files for a new validator.
• Added information about how to use create_new_validator.py to how_to_contribute.md.

How was this PR tested?

Tested the following command at the autoware_tools/map/autoware_lanelet2_map_validator directory, and checked four files are generated correctly.

./template/create_new_validator.py --base_directory ./ \
--category_name intersection \
--code_name turn_direction_checking \
--class_name TurnDirectionValidator \
--validator_name mapping.intersection.turn_direction_tagging \
--check_function_name check_turn_direction

Then the output should be like

Create ./src/validators/intersection/turn_direction_checking.cpp
Create ./src/include/lanelet2_map_validator/validators/intersection/turn_direction_checking.hpp
Create ./test/src/intersection/test_turn_direction_checking.cpp
Create ./docs/intersection/turn_direction_checking.md
Process complete.

Notes for reviewers

None.

Effects on system behavior

None.

[github-actions]

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[soblin]

LGTM

ros2 run lanelet2_map_validator create_new.py <args> is also good

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.40%. Comparing base (ad0b811) to head (0768432).
Report is 101 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #180       +/-   ##
==========================================
+ Coverage   2.12%   38.40%   +36.27%     
==========================================
  Files        163       27      -136     
  Lines       9402      638     -8764     
  Branches     383      379        -4     
==========================================
+ Hits         200      245       +45     
+ Misses      9045      178     -8867     
- Partials     157      215       +58     

Flag	Coverage Δ
differential	38.40% <ø> (?)
total	?

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