[Field formatters] Duration formatter should have an option to add suffixes to time

[wylieconlon]

The duration field formatter is particularly hard to use compared to what users expect, but I think there is a small amount of code that could improve the experience significantly. Specifically, the field formatter for duration should allow a short suffix to be added using a checkbox, and the suffix should be selected from the list of suffixes. For example, event.duration is measured in nanoseconds, but probably should be displayed in milliseconds with the suffix ms.

It's possible that the "with suffix" option should be default, but in the interest of making this a non-breaking change I don't think this is actually a requirement.

Screenshots:

Unformatted:

Formatted as milliseconds using the current formatter:

Formatted as milliseconds with a label:

This is related to the Lens number formatting options.

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)