[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)
I put it because: 
- this field is not displayed in Odoo apps, and it's important information ; Sample: https://www.odoo.com/apps/7.0/web_widget_float_formula/
- it is possible to add a link, to help new people to discover the licences;

Regards.