`pkg create --build-type ament_python` should warn about hyphens in pkg-name

Bug report

Required Info:

• Operating System:
  • Ubuntu 22.04
• Installation type:
  • binaries
• Version or commit hash:
  • humble
• DDS implementation:
  • /
• Client library (if applicable):
  • ros2cli

Steps to reproduce issue

cd src
ros2 pkg create --build-type ament_python --license MIT --node-name hello-world  hello-world-python-1   # build breaks
ros2 pkg create --build-type ament_python --license MIT --node-name hello_world  hello-world-python-2   # build breaks
ros2 pkg create --build-type ament_python --license MIT --node-name hello-world  hello_world_python_3   # build breaks
ros2 pkg create --build-type ament_python --license MIT --node-name hello_world  hello_world_python_4   # build works
cd ..
colcon build --packages-select hello-world-python-1 # breaks
colcon build --packages-select hello-world-python-2 # breaks
colcon build --packages-select hello_world_python_3 # breaks
colcon build --packages-select hello_world_python_4 # works

Expected behavior

When running ros2 pkg create with --build-type ament_python warn about hyphens in the name / or abort pkg creation.

Actual behavior

No warning

Additional information

Not really a bug of ros2cli but also not really a feature request. I'd expect a warning, thats why I put it as a bug report.
I assume the check can easily be added here.

If there is agreement on that, I can open a PR with it. Please let me know :)

For reference: PEP-8: Package and Module Names

Start in ros2pkg/ros2pkg/verb/create.py around the referenced package-creation logic, then reproduce the four commands in the issue to compare hyphenated and underscored names. Done means ament_python package creation clearly warns about or rejects hyphens, with the resulting behavior verified against the reported colcon build cases.