Add last_editor to LCLS happi item?

[klauer]

Context

Container:

pcdsdevices/pcdsdevices/happi/containers.py

Line 12 in 17b0a0f

class LCLSItem(OphydItem):

device_config keeps track of our changes: https://github.com/pcdshub/device_config/
We open monthly-ish PRs to review changes from the database prior to merging: pcdshub/device_config#44
The date items were changed is recorded, but the associated username is not.
It may be helpful for us to include "who last touched this item" in order to know who to ask when questions arise in that diff.

[tangkong]

This would also require a commensurate change in happi in order to collect that information.

some digging to save myself some time later, though this should probably show up as an issue in happi: item.save is bound on load (source)

[klauer]

Should there be a happi hook for "container to be saved" I wonder?
We can't (or shouldn't) go and change the default HappiItem for this information of course