Grouping helpers like anything else

[davux]

For some reason, the grouping options on the Helpers page is much more reduced than for other kinds of objects. For example, it's currently not possible to group helpers by Area, Device, Enabled...

I initially wanted to report it as a bug, as it makes the frontend inconsistent with the rest of the functionality, but feature request seems more prudent as it's my first issue for HA (I think) and I'm not familiar with how issues ought to be reported.