Constrain inputs for lib.timezone settings to valid tzdata names

[Galen Charlton]

Inspired by bug 1752753, it would be nice if the library settings editor presented a list of valid timezone names for the user to choose from when setting the lib.timezone org unit setting.

(This would probably be part of a larger, hypothetical project to make a new Angular library settings editor be smarter and more usable.)

Evergreen master

[Mike Rylander (mrylander)]

Note: we have the list of available timezones in JS via moment.tz.names(), which returns an array of known, valid timezone names.

[Remington Steed (rjs7)]

I'm adding documentation tags, since we should at least give people a clue of the input format in the setting name or description, and the docs. (I found myself guessing at "EST", or "-5:00"...).

Maybe we could point people to Wikipedia for now:

https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

[Remington Steed (rjs7)]

I've opened a new bug for the documentation aspects of this:

bug 1817332

[Jane Sandberg (sandbergja)]

Noting that you can get an array of supported values in vanilla JS using Intl.supportedValuesOf('timeZone')