[ADD] new module 'module_parent_dependencies'

Add a module 'module_parent_dependencies' that allows admin user to see the modules that depend of a target modules. (direct and undirect dependencies)
Flake8: OK;
Coverage: 100%;

(Sample:  https://github.com/legalsylvain/server-tools/blob/a9761578835226ab8df897b1ba397d8e6e85987d/module_parent_dependencies/static/src/img/screenshots/dependencies_list.jpg)
Hi Holger, 
thanks for your review. I'm sorry but I don't understand your question. What don't you find unnecessary ? l35 & 36 ?
If yes, the objective is just to remove duplicated ids. res[id] give the parents, and parent_ids is the concatenation of all the direct parents, but unique, to avoid to call _get_all_parent_ids (l37) with the same args.
I can see that there is maybe a shorter recursive function to do the same things.
 
Regards.