Add reusable workflows and hooks in addons

[mmacata]

name	type	grass-his-helpers	GH workflows					pre-commit
		used?	black	flake8	pylint	tests	python-publish (PyPI)	black	flake8	pylint	tests
v.example	addon	-	✓¹	✓¹	✓¹	-	-	✓¹	✓¹	✓¹	-
TODO	addon

¹ - uses reusable workflows from github-workflows
² - not using reusable workflows on purpose
³ - not using reusable workflows - TODO check if can be used or be made reusable