add some lint tools

[Plumezz]

add some lint tools

[christophfroehlich]

Looks good, please also fix the linter errors now.

[Plumezz]

Sorry, I just fixed the cppllint errors. Now I have no idea about the copyright error,

[christophfroehlich]

It is missing the license type in the copyright claim
https://github.com/PickNikRobotics/generate_parameter_library/blob/main/example_external/src/minimal_publisher_external.cpp#L1
as the repo has BSD-3-Clause license, just add the missing lines like from here.

[Plumezz]

Ok, I tried to fix it.

[christophfroehlich]

Have you ran the tests locally? (pre-commit and colcon test?)

[Plumezz]

Sorry, I modified files in the original directory without adding lint tools. So there is no error in the output of command colcon test and I commit the changed files. Now I run colcon test again, it has the same lint copyright erroos.

Sorry for my careless PR.