Come up with better alternatives for groupings on the modules page

This issue stems from #538904: D8UX: Redesign Modules Page →

The Problem

On the modules page, it gets harder and harder to find / enable / disable desired modules, the more modules are installed in a Drupal site. This is partially to do with the previous use of 'packages' which are often misunderstood, and sometimes intentionally misused by module maintainers.

Proposed resolution options

1) get rid of "packages" (see 📌 Remove packages from modules list and .info files Closed: outdated
2) Use something else to organize the modules page

Ideas for "something else"

Module category from drupal.org project form
- doesn't need to be provided by maintainer
- discreet set of options
- can be limiting for modules that don't fit in the options available

Downloaded / uploaded together
- indication of which "modules" came in which "module"
- similar to the updates page (admin/reports/updates)

"tags" or "labels"
- also up to the module maintainer
- unlimited number of options
- .info file syntax: tags[] = Administration

Dependencies
- which modules depend on others
- which modules are required by others

Extensions
- (someone please explain extensions?)

Parents
- (someone please explain parents?)