[R] Add binding for lubridate::duration() and/or as.difftime()

[asfimport]

After ARROW-14941 we have support for the duration type; however, there is no binding for lubridate::duration() or as.difftime() available in dplyr evaluation that could create these objects. I'm actually not sure if we should bind lubridate::duration since it returns a custom S4 class that's identical in function to base R's difftime.

Reporter: Dewey Dunnington / @paleolimbot
Assignee: Dragoș Moldovan-Grünfeld / @dragosmg

Related issues:

• [R] Implement bindings for lubridate::duration() (is duplicated by)
• [R] Implement bindings for lubridate's date_decimal and decimal_date (is depended upon by)
• [R] Bindings for lubridate's dpicoseconds, dnanoseconds, desconds, dmilliseconds, dmicroseconds (is depended upon by)
• [R] Implement lubridate::make_difftime (is depended upon by)
• [R] Update as.Date() to support an origin different from epoch (is depended upon by)
• [R] Implement bindings for lubridate::as_date() and lubridate::as_datetime() (is depended upon by)

PRs and other links:

• GitHub Pull Request #12506

_{Note: This issue was originally created as ARROW-15098. Please see the migration documentation for further details.}

[asfimport]

Dragoș Moldovan-Grünfeld / @dragosmg:
This ticket should probably cover adding bindings for base::difftime() too. 

[asfimport]

Jonathan Keane / @jonkeane:
Issue resolved by pull request 12506
#12506