Introduction ament_mypy

[Nils-ChristianIseke]

Feature request

Introduce ament_mypy to the codebase, to enforce and check type hinting on python code.

Feature description

Increasing the Python code quality by introducing a static type checker.

Implementation considerations

See how to use mypy with an existing codebase.
To generate type hints automatically one could use tools like pyannotate or monkeytype.

[SteveMacenski]

Should this be in nav2 or in the ament linting: https://github.com/ament/ament_lint

PS it looks like mypy is already there 🙃 So, we should be able to simply add it to our CI in a github action!

[SteveMacenski]

Smac Planner state lattice generator is completed!

[leander-dsouza]

Hey Steve, I have tried integrating this over at #5022.

[SteveMacenski]

Lovely, thanks!

[SteveMacenski]

Reopening, I think that was just for smac planner, yeah?

[leander-dsouza]

Reopening, I think that was just for smac planner, yeah?

Yes, all the remaining python packages need to be added as well.