create test and pylint CI workflows; use devops_tests as a submodule; add show_anim(); bump checkout & setup-python actions in pylint CI job; move more setup entries into pyproject.toml; add example notebook with animation

create test and pylint CI workflows; use devops_tests as a submodule; add show_anim(); bump checkout & setup-python actions in pylint CI job; move more setup entries into pyproject.toml; add example notebook with animation #73